EDGEWOOD, Md. — A man with a lengthy criminal past who showed up for work at a countertop company on Wednesday and shot five of his co-workers has been arrested, authorities said. Three of them were killed and two critically wounded. Less than two hours later, Radee Labeeb Prince drove to a used car lot about 55 miles away in Wilmington, Del., and opened fire on a man with whom he had “beefs” in the past, wounding him, police said. The shooting rampage set off a manhunt along the Interstate 95 Northeast corridor.