Big fires continue to plague Camden, N.J.Just ten days after 12- and eight-alarm fires occurred two days apart of each other, another large multi-alarm blaze struck the city early Sunday morning.Crews responded to a seven-alarm fire at the former site of the Concord Chemical Plant on the 1700 block of Federal Street at approximately 5:15 a.m., according to WPVI.Flames were shooting from the upper floors when firefighters arrived and parts of the building collapsed.