An "electronic ping" was picked up from the Malaysia Airlines flight by satellites after the plane lost contact with ground control, Reuters reports. Meanwhile, US officials have been given an "indication" the plane crashed into the Indian Ocean.
Interpol secretary general has said he believes the disappearance of the Malaysia Airlines plane is not a terrorist incident.
"The more information we get, the more we are inclined to conclude it is not a terrorist incident," Ronald Noble said.
He said the two men had swapped their passports in Kuala Lumpur to use stolen Austrian and Italian passports to board the missing flight.
Authorities have identified the men as Pouria Nour Mohammad Mehrdad, 19, and Delavar Seyed Mohammadreza.
A mother has described her frustration as she waits for answers on the fate of her missing son who is on board the missing Malaysia plane.
Malaysia's military believes a jetliner missing for almost four days turned and flew hundreds of kilometres to the west.
The wife of a passenger travelling on the missing Malaysia Airlines flight has spoken of her struggle to cope as she waits for news.