A note is posted for family members of passengers aboard Malaysia Airlines Flight MH370 at the airport in Beijing.
Story by Craig Boswell, CBS News
(CBS News)-- A team from the National Transportation Safety Board is on the ground in Kuala Lumpur to assist in the investigation of the Malaysia Airlines plane that vanished.
But right now- there's no scene to investigate.
STORY: Still no sign of missing Malaysia Airlines flight
Three days after Flight 370 disappeared while flying from Kuala Lumpur to Beijing- no debris has been found in Southeast Asian waters.
Tests on an oil slick and what looked like pieces of the plane proved negative.
RELATED: Oil slick not from missing plane
The search involving 34 aircraft and 40 ships from a number of countries including the US- has been extended to a 115 mile radius.
"Whatever happened, probably happened quickly, and either kept the pilots from communicating or kept them so busy, until they could no longer communicate," said Chesley Sullenberger, CBS News Aviation and Safety Expert.
Investigators have determined two men used stolen passports to board the plane- but so far there's no connection to terrorism, and no credible claims of responsibility.
SEE ALSO: Iranian linked to stolen passports on doomed jet
Sources tell CBS News the men could have been part of a human trafficking operation.
In total, 239 people were on board the Boeing Triple 7, including three Americans.
Sarah Bajc's boyfriend Philip Wood is one of them.
"If there's anybody that could survive something like this, it's him," said Sarah.
As investigators work to find the wreckage, the lack of debris could be a clue that the plane didn't explode in mid-air, but rather hit the water intact.
SEE ALSO: How can a jet disappear? In the ocean, it's not hard
The investigation has extended to a beach resort in Thailand, where the plane tickets used by the men with the stolen passports were issued through an Iranian middleman.
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