Story highlights Donald Trump was asked Wednesday about a Tuesday report from Dutch investigators that Malaysia Airlines Flight 17 was shot down in 2014 by a Russian-made rocket

But Trump later said the culprit was "probably" Russia and pro-Russian fighters

Washington (CNN) Donald Trump doesn't believe there is enough evidence to blame pro-Russian separatists for last year's downing of a commercial airliner over Ukraine -- despite the fact that the U.S. intelligence community believes "with confidence" that pro-Russian separatists shot it down.

"That's a horrible thing that happened," he said. "It's disgusting and disgraceful but Putin and Russia say they didn't do it, the other side said they did, no one really knows who did it, probably Putin knows who did it. Possibly it was Russia but they are totally denying it."

Trump was responding to a question from CNN noting that the U.S. government assesses that the several points of available evidence all point to Russia.

The question from CNN came after Trump was asked on MSNBC Wednesday about a new report from Dutch investigators that Malaysia Airlines Flight 17 was shot down by a Russian-made rocket and warhead -- and asked what he would do as president to hold Russia accountable.

U.S. intelligence determined with confidence soon after the attack that a Russian-supplied missile brought the jet down from territory controlled by pro-Russian separatists. U.S. intelligence continues to stand by that assessment.

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