people who were trapped under the heavy debris. >> the people in the building you could hear hollering for help. other guys responded. ran up. jumped in. passed me a lady. >> reporter: the search for more victims went into the evening as portable lights lit the area for backhoe operators who had been removing piles of brick and metal. >> our hope is that any one that is inside is in a void and we can have a person that -- a live rescue. if not, we will, we will just take this apart a little bit at a time. >> reporter: meanwhile, the investigation into the deadly incident has begun, with local state, federal officials on the ground. the city says philadelphia-based company griffin campbell construction had an active permit for the demolition and there were no existing violations. still, people who stopped by to see the site say there are question that need to be answered. >> i'm surprised people are that close to, when they were destroying the other building. >> reporter: the fire commissioner says the search