Mystery Passengers ID'd

The disappearance of Malaysia Airlines Flight 370 does not appear to be related to terrorism, the head of the international police organization Interpol said Tuesday.

"The more information we get, the more we're inclined to conclude that it was not a terrorist incident" Interpol Secretary General Ronald Noble said at a news conference in Lyon, France.

Among the evidence pointing in that direction, he said: news from Malaysian authorities that one of two people said to be traveling on stolen passports, an Iranian, was trying to travel to his mother in Germany.

Further, there's no evidence to suggest either was connected to any terrorist organizations, according to Malaysian investigators.

The two passengers in question entered Malaysia using valid Iranian passports, Noble said at a news conference. But they used stolen Austrian and Italian passports to board the missing Malaysian plane, he said.

Noble gave their names and ages as Pouria Nour Mohammadi, 18, and Delavar Seyed Mohammad Reza, 29.

Malaysian police had earlier identified Mohammadi, using a slightly different name and age, and said they believed he was trying to migrate to Germany.

Inspector General Khalid Abu Bakar of the Royal Malaysian Police said it doesn't appear the younger Iranian posed a threat.

"We have been checking his background. We have also checked him with other police organizations of his profile, and we believe that he is not likely to be a member of any terrorist group," Khalid said.

After he failed to arrive in Frankfurt, the final destination of his ticket, his mother contacted authorities, Khalid said. According to ticketing records, the ticket to Frankfurt was booked under the stolen Austrian passport.

The bigger piece of the puzzle

The identification of one of the men helps peel away a thin layer of the mystery surrounding the passenger jet, which disappeared about an hour into its flight from Kuala Lumpur to Beijing.

But in the bigger puzzle of the missing plane's whereabouts, there were no reports of progress Tuesday.

Every lead that has raised hopes of tracing the commercial jet and the 239 people on board has so far petered out.

"Time is passing by," a middle-aged man shouted at an airline agent in Beijing on Tuesday. His son, he said, was one of the passengers aboard the plane.

Most of those on the flight were Chinese. And for their family members, the wait has been agonizing.

There were also three U.S. citizens on the plane, including Philip Wood.

"As of yet, we know as much as everyone else," Wood's brother, Tom, told CNN's "AC360" Monday. "It seems to be getting more bizarre, the twists in the story, where they can't find anything. So we're just relying on faith."

The challenge facing those involved in the huge, multinational search is daunting; the area of sea they are combing is vast.

And they still don't know if they're looking in the right place.

"As we enter into Day 4, the aircraft is yet to be found," Malaysia Airlines said in a statement released Tuesday.