NEW : Two U.S. lawmakers demand information about their status . PA : Governor McCaul says it is a ` ` serious hole '' in national security . DHS orders the cancellation of foreign student visas . Two victims of the Boston bombing suspect reportedly overstayed their visa .
NEW : Two U.S. lawmakers demand answers about their status . NEW : Rep. McCaul says it shows a `` serious hole '' in national security . DHS orders the verification of foreign student visas . Two friends of the Boston bombing suspect reportedly overstayed their visas .