PHILADELPHIA (CBS) – Parents rallied outside the Masterman School over concerns about asbestos. Eyewitness News was at the school at 17th and Spring Garden Streets on Monday morning, where parents say they are concerned over conditions inside the building.

“We need safe, safe buildings, the fact that we can’t go into this building is atrocious,” parent Maria Beatty said.

READ MORE: Mets, Phillies Minor Leaguers Protest Pay With Wristbands

Teachers say they want documented proof that all damaged asbestos was removed from the school. They protested last week outside the school, refusing to go inside to prepare for the start of classes.

READ MORE: Man Dead, A Dozen Residents Displaced After Southwest Philadelphia Fire

Superintendent William Hite disputes the claims, saying the complaints appear to be based on incomplete information.

MORE NEWS: Official First-Edition Printed Copy Of U.S. Constitution Set To Go Up For Auction

Students are set to return to school there on Tuesday.