KUALA LUMPUR, Malaysia (AP) -- Another possible clue to the disappearance of a Malaysian jetliner has turned out to be unconnected to the plane.
Malaysian maritime officials had found some oil slicks in the South China Sea, and they sent a sample to a lab to see if the oil came from the missing plane. They say tests showed that the oil was not from an aircraft.
Earlier, searchers investigated a yellow object that looked like a life raft. It turned out to be trash covered with moss that was floating in the ocean.
Meanwhile, authorities in Thailand have been questioning the owners of a travel agency that sold one-way tickets to two men who are now known to have been traveling on the flight using stolen passports. Interpol says it's trying to determine their identities.
The police agency says it has a database of 40 million stolen or lost travel documents -- but that last year, more than a billion times, travelers boarded planes without their passports being checked against the database.
The plane was on a flight to Beijing when it disappeared over the weekend with 239 people on board.