At least one person was taken into custody outside a Rosemead business that had been burglarized overnight.The owner of JC Company Mart, at 8062 Garvey Ave., called police at about 5:20 a.m. Thursday to report his business' security system had detected movement at the closed storefront. The owner told authorities this wasn't the first break-in at his store – a previous burglary occurred when someone got in through the roof.The business owner went out to the store to let the deputies in, but a Los Angeles County Fire truck was called in so deputies could find how the intruder made entry. Once the deputies got up to the roof, they found an air conditioning unit had been removed so a person could get into the building. Within the hour, one man in baggy, light-colored shorts and a dusty black shirt had been taken into custody. But authorities say a second suspect may still be in the store.