LONDON, July 18 -- British Prime Minister David Cameron on Friday urged all governments concerned to "get to the bottom of what happened and how it happened" to Malaysia Airlines flight MH17, which crashed Thursday in eastern Ukraine with more than 290 people onboard.

"It is an absolutely appalling, shocking, horrific incident that has taken place and we have got to get to the bottom of what happened and how it happened. We have some information but we need to find more," Cameron said in a statement.

Malaysia Airlines flight MH17, a Boeing 777-200, was en route from Amsterdam to Kuala Lumpur when it went down Thursday in eastern Ukraine with 298 passengers and crew aboard, according to Malaysian Airlines.

No survivors have been found on the crashed plane.

"My thoughts are with those who lost loved ones on flight MH17, including the families of the British citizens on board," Cameron said.

The prime minister said he has been on the telephone Friday to the Australian Prime Minister Tony Abbott and the Dutch Prime Minister Mark Rutte, whose countries have suffered loss of life as well.

"I've also been in contact with the Malaysians and will be making other calls so we can share the information we have between us," he added.

"If, as seems possible, the plane was brought down then those responsible must be held to account and we must lose no time in doing that," he continued, adding that the "absolutely shocking" incident "cannot be allowed to stand."

The prime minister called on all governments concerned to cooperate in investigating the incident.

"What is absolutely necessary is for all governments to cooperate in every way they can to get to the bottom of what happened, to make sure that this site can be properly investigated, and to make sure that the bodies of loved ones can be properly recovered," he urged.

The latest breakdown of nationalities of those on board provided by the Malaysia Airlines was as follows: the Netherlands (189), Malaysia (44, including 15 crew), Australia (27), Indonesia (12, including 1 infant), Britain (9), Germany (4), Belgium (4), the Philippines (3), Canada (1), New Zealand (1), unverified (4).