12.23pm: CNN reports that the United States government has concluded that MH17 was shot down by a missile although it has not identified the shooter.
Quoting a senior US official, CNN reports a radar system saw a surface-to-air missile system 'turn on' and track an aircraft right before the plane went down.
And a second system saw a heat signature at the time the airliner was hit.
The US is analysing the trajectory of the missile to pinpoint where the attack came from, the official says.
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