Not ruling anything out . `` We have not been able to locate anything , '' an airline official says . U.S. law enforcement sources say both passports were stolen in Thailand . The FBI is investigating the theft and has asked Thai authorities for help finding the two men who allegedly stole them. Vietnamese searchers spot oil slicks in the South China Sea .
`` We have not been able to locate anything , '' an airline official says . U.S. law enforcement sources say both passports were stolen in Thailand . The FBI is investigating the theft and has asked Thai authorities for help finding the two men who allegedly stole them. Vietnamese searchers spot oil slicks in the South China Sea .