Chester High School students participate in the walkout.

Chester High School students participate in the walkout.

Chester High School students participate in the walkout.

PETE BANNAN-DIGITAL FIRST MEDIA A Haverford High School student hold up a sign as she walks out of school to the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting. They then held speeches and music before returning to classes. School officials said students organized the event while working with the adminstration.

PETE BANNAN-DIGITAL FIRST MEDIA A Haverford High School student holds up a sign as he walks out of school to the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting. They then held speeches and music before returning to classes. School officials said students organized the event while working with the administration.

PETE BANNAN-DIGITAL FIRST MEDIA A Haverford High School student holds up a sign as she walks out of school to the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting. They then held speeches and music before returning to classes. School officials said students organized the event while working with the administration.

North Penn High School students walk out. Photo by Dan Sokil

Haverford police were around at Haverford High School. Photo by Pete Bannan

Haverford High School teachers head out. Photo by Pete Bannan

Pottstown High student leaders prepare for student walk out in recognition of school shootings in Florida. Photo by Evan Brandt

North Penn High School students reading the names of Florida shooting victims at school courtyard - a solemn silence as names are read and @NPTV students are recording the ceremony. Photo by Dan Sokil

Lower Merion students protest. Photo by Linda Stein.

Pottstown High School students prepare to exercise their First Amendment rights with full support of the administration. . Photo by Evan Brandt

Police and others blocked access to Penncrest High School.

Haverford students protest. Photo by Pete Bannan

North Penn students pause after names are read. Photo by Dan Sokil

Lower Merion students march around the school. Photo by Linda Stein.

Student organizers at at North Penn say they'll also hold an event after school to share thoughts on gun violence and hold voter registration drive . Photo by Dan Sokil

Haverford students chanting “no more gun violence” as they walk around track. Photo by Pete Bannan

Student speakers address the combined student populations of Pottstown High School and Pottstown Middle School during Wednesday's student walk-out in memory of those who died in Florida school shooting on Feb. 14. Photo by Evan Brandt

North Penn Superintendent and school board president talking to student organizers. Photo by Dan Sokil

Around 700 students walked out of Pottsgrove High School at 10 a.m. on Wednesday as part of National Walkout Day. Photo by Marian Dennis

Students set up a "Never Again" sign along the grounds of Pottsgrove High School as 700 students walked out and honored the 17 victims of the Marjory Stoneman Douglas shooting. Photo by Marian Dennis

At 10 a.m. Wednesday, 700 students walked out of Pottsgrove High School to make their voices heard on National Walkout Day. Photo by Marian Dennis

Students from Pottsgrove High School lined School lane with signs about school gun violence as part of National Walkout Day. The students took 17 minutes out of their school day to demonstrate. Photo by Marian Dennis

Students at Pottsgrove High School held hands and hugged as student leaders read aloud the names of the 17 victims of the Marjory Stoneman Douglas High School shooting. Photo by Marian Dennis

Student leaders shed tears and they read the names of the 17 victims of the Marjory Stoneman Douglas shooting during National Walkout Day. Photo by Marian Dennis

Around 700 students walked out of Pottsgrove High School for 17 minutes Wednesday to honor the victims of the Marjory Stoneman Douglas shooting last month. The demonstration was part of a nationwide movement called National Walkout Day. Photo by Marian Dennis

Evan Brandt -- Digital First Media Pottstown High School junior Emily Hart, left, and sophomore Mariana Pearson, helped to organize the student walk-out at Pottstown High School Wednesday.

Photo Courtesy of Kate Erb Students speak at the walk-out at Owen J. Roberts High School Wednesday.

Evan Brandt -- Digital First Media Students gather outside Pottstown High School in advance of the walk-out ceremonies there Wednesday.

Evan Brandt -- Digital First Media Pottstown High School students gathered around the flagpole in front of the school for their walk-out Wednesday in recognition of those who died in the shootings at Marjorie Stoneman Douglas High School in Parkland Florida Feb. 14.

Evan Brandt -- Digital First Media Pottstown High School's a capella choir also sang at the walk-out ceremonies at Pottstown High School Wednesday.

Evan Brandt -- Digital First Media Speakers address the Pottstown High School walk-out Wednesday. At left, are Pottstown Middle School students who walked over to the high school behind a banner that said simply "Enough."

PETE BANNAN-DIGITAL FIRST MEDIA Haverford High School students walk out of school to the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting. They then held speeches and music before returning to classes. School officials said students organized the event while working with the administration.

PETE BANNAN-DIGITAL FIRST MEDIA Haverford High School students hold up a signs as they walk out of school to the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting. They then held speeches and music before returning to classes. School officials said students organized the event while working with the administration.

PETE BANNAN-DIGITAL FIRST MEDIA A Haverford High School student hold up a sign as she walks out of school to the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting. They then held speeches and music before returning to classes. School officials said students organized the event while working with the administration.

PETE BANNAN-DIGITAL FIRST MEDIA Haverford High School students walks out of school to the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting. They then held speeches and music before returning to classes. School officials said students organized the event while working with the administration.

PETE BANNAN-DIGITAL FIRST MEDIA A Haverford High School student hold up a sign as she walks back to school from the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting. They then held speeches and music before returning to classes. School officials said students organized the event while working with the administration.

PETE BANNAN-DIGITAL FIRST MEDIA Haverford High School student return from the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting then held speeches and music before returning to classes. School officials said the students organized the event while working with the administration.

PETE BANNAN-DIGITAL FIRST MEDIA Haverford High School students walk of school to the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, they walked arounf the track 17 times to remember the students killed in the Florida school shooting then held speeches and music before returning to classes. School officials said the students organized everything.

PETE BANNAN-DIGITAL FIRST MEDIA Members of the public gather to support Haverford High School students who walked out of school for the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, including walking around the track 17 times to remember the students killed in the Florida school shooting. They then held speeches and music before returning to classes. School officials said students organized the event while working with the administration.

PETE BANNAN-DIGITAL FIRST MEDIA Elaine Vatre of Havertown holds up a sign in support of Haverford High School students who walked out of school for the Student Unity Rally held at Cornog Field Wednesday morning. Vatre was one of about a dozen adults who stood across from the school in support of the students.

PETE BANNAN-DIGITAL FIRST MEDIA A Pennsylvania State police car outside Penncrest High School Wednesday morning. The campus was clsed during the student walkout.

PETE BANNAN-DIGITAL FIRST Haverford High School students return from their Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, they walked arounfd the track 17 times to remember the students killed in the Florida school shooting then held speeches and music before returning to classes. School officials said the students organized the event while working with the administration.

PETE BANNAN-DIGITAL FIRST MEDIA A Upper Providence police officer outside Penncrest High School Wednesday morning. The campus was clsed during the student walkout.

PETE BANNAN-DIGITAL FIRST MEDIA A Haverford High School student holds up the peace sign as he walks out of school to the Student Unity Rally held at Cornog Field Wednesday morning. School officials estimated over 900 students took part, they walked around the track 17 times to remember the students killed in the Florida school shooting then held speeches and music before returning to classes. School officials said the students organized everything.

Chichester students created a protest banner.

Chichester Students wrote letters of protest.

More than 100 students, faculty, and staff from Gwynedd Mercy University participated in the National School Walkout. Students gathered around the campus bell tower for 17 minutes of silence as the bells rung 17 times in honor of the victims, survivors, and their families. The goal of the national protests is to urge lawmakers to enact stricter gun laws to prevent future mass shootings. (Submitted photo)

More than 100 students, faculty, and staff from Gwynedd Mercy University participated in the National School Walkout. Students gathered around the campus bell tower for 17 minutes of silence as the bells rung 17 times in honor of the victims, survivors, and their families. The goal of the national protests is to urge lawmakers to enact stricter gun laws to prevent future mass shootings. (Submitted photo)

Radnor High School students walked out of class for National Walkout Day. (Submitted photo)

Radnor High School students walked out of class for National Walkout Day. (Submitted photo)

Radnor High School students walked out of class for National Walkout Day. (Submitted photo)

Photo by John J. Armato Students from Pottstown Middle School march to the National Walk-Out event at Pottstown High School Wednesday behind a banner with a simple, but powerful message.

Photo Courtesy of Katie Scanlan Students at Pottstown Middle School wore wrist-bands to get their point across during Wednesday's National Walk-Out protest.