Officials say soldiers were chasing drug criminals who had fired on an army patrol . They said some criminals had fled to Technological Institute of Higher Learning of Monterrey . Score: 6 Interior Ministry apologizes for deaths , pledges more intense investigation .
Officials say soldiers were chasing drug criminals who had fired on an army patrol . They said some criminals had fled to Technological Institute of Higher Learning of Monterrey . Initially , officials said mechanical engineering graduate students were drug gang members . Interior Ministry apologizes for deaths , pledges more intense investigation .