this is cnn's breaking news coverage of the deadly amtrak train derailment in philadelphia. you're looking at live pictures right now from that scene. north of 30th street situation in philadelphia. this is what we know right now, five people killed. at least 136 people have been treated at local hospitals through the course of the night and morning. fire officials say that six of those injuries are critical. the city's fire commissioner says he's just stunned by the devastation at the scene. list ton him describing a huge rescue effort. >> we used our drive tools to get to the people who could not self-evacuate. there were several people trapped. again, train cars are overturned. they're in horrible shape. there's a bunch of debris down there, objects. it's a dangerous situation for