At least seven people were killed and 19 were injured when an air ambulance crashed to the ground on a busy Philadelphia street, creating what witnesses described as a massive fireball and a chaotic s

It could be days — or more — until authorities are able to confirm the number of dead and injured, said Adam Thiel, the city's managing director. As of Saturday morning, officials confirmed seven dead — six on the jet, one person on the ground — and 19 injured.