PHILADELPHIA (AP) - Police in Philadelphia say a homeless man sleeping in a trash bin wound up in the back of a garbage truck and was killed by the vehicle's compactor. Investigators say the truck collected the contents of the trash bin at about 4 a.m. Wednesday in North Philadelphia. The truck's driver activated the compactor a little later. Police say the driver told officers he thought he heard someone say, "Yo! Yo! Yo!" but did not know where the voice was coming from. He heard the cry again, fainter, at his next stop and alerted authorities.