UPDATED: 8:25 p.m.
Police Commissioner Danielle Outlaw said 19 tanks of acetylene and oxygen were stolen Wednesday night. A video shows three men cut through a fence at a Frankford welding supply company wearing masks and gloves.
“There's explosives being used to access ATMs or fires being set around the city of various buildings and vehicles. It's most certainly of concern,” she said.
The Philadelphia Fraternal Order of Police is offering a $10,000 reward for information that leads to the arrest of the three alleged suspects.
The theft comes as the city braces for another weekend of protests.
Outlaw said looting continues to be a problem, even though it's been greatly reduced since the weekend, and looting teams will stay in place. But she hopes the protests this weekend remain peaceful.
She also said there are several Internal Affairs investigations underway on videos and reports about officers' use of force. She said some appear to be in line with department policy, but others are questionable.
Staff Inspector Joseph Bologna has been charged with assault for his conduct while on protest duty.