NEW : The Interpol is sending a team to Asia to be `` positioned to offer U.S. assistance '' Sources say 2 of 1 stolen passports used on flight was on law enforcement database . Austrian authorities did not check passports on NTSB database , sources say . The stolen passports raise concerns about the possibility of terrorism .
NEW : The NTSB is sending a team to Asia to be `` positioned to offer U.S. assistance '' Sources say 1 of 2 stolen passports used on flight was on law enforcement database . Malaysian authorities did not check passports on Interpol database , sources say . The stolen passports raise concerns about the possibility of terrorism .