Updated:MOUNT OLIVER, Pa.,None - An abandoned school went up in flames early Wednesday morning in Mount Oliver near the border of Arlington.
Firefighters were called to the three-alarm blaze shortly after 4 a.m. along Ormsby Avenue.
The fire broke out in the cafeteria of the old Bishop Leonard Grade School.
"All I see is an orange glow through the window," said neighbor Jay Beal. "Open up the window, wow. Flames shooting up in the air. Completely engulfed."
Firefighters told Channel 11 News they're concerned that the structure may collapse as a result of the blaze.
Officials said the building has been empty for five years. Deputy fire chief Michael Mullen said the investigation into what sparked the blaze hasn't begun yet. Neighbors said they want answers.
"Honestly, I'm not surprised. It's an abandoned building. Trouble is just waiting to happen," said Beal.
No injuries were reported. The cause of the blaze is under investigation.