CHILEAN authorities said they were investigating a violent heist in Chile's main seaport where thieves stole several shipping containers filled with copper belonging to state-owned giant Codelco. Juan Carlos Catalan, the local prosecutor, said in a statement that ten armed men entered the San Antonio port early on Tuesday morning, attacked workers and stole 13 containers, 12 of which had copper. "There was one guard and four workers that (the assailants)tied up and beat and left locked up," Catalan said, adding that workers alerted authorities after they freed themselves. Catalan said authorities are investigating and reviewing security footage but have…