if you know philadelphia, this building, this massive building, four stories, collapsed. this happened right around 10:45 eastern this morning. and beneath this -- the wall of bricks and the debris, people may still be trapped. rescuers, you see them working in teams, gingerly moving brick by brick, to search for survivors. but as bad as this scene looks, we do have some good news that 13 others made it out alive with amazingly minor injuries. i want to go straight to the scene to cnn's sarah hoy who has been covering this as the whole thing broke. sarah, i've been listening to your reporting and a lot of different information, if you will, with regard to how many people are still trapped. so set it straight for me. is anyone still trapped? >> what we're hearing is there were 13 people removed and one is still trapped. however no one can confirm exactly how many people are under that rubble.