A seven-alarm fire broke out in a vacant chemical plant in New Jersey Sunday morning, dispatching dozens of firefighters and Hazmat crews to inspect for chemical damage. The fire caused the building to partially collapse while nearby homes were evacuated. The plant has been vacant for two years, and the EPA carried out a $1 million cleanup of asbestos and other explosive materials in May. This is the third mysterious fire to hit Camden - one of the country's poorest cities - over the last two weeks. Police said they are holding a suspect in connection to the fire.