According to the Wall Street Journal, the U.S. Intelligence Service confirms that the missile which hit the plane was of a ground-to-air class; however, the intelligence's source doesn't say whom the missile was fired by.
The U.S. agencies are divided over whether the missile was launched by the Russian military or by pro-Russia separatist rebels, who officials say lack the expertise on their own to bring down a commercial airline in midflight.
"All roads lead to the Russians to some degree," said a U.S. official.
Watch also: Video from the Crash Site of the Malaysian Airlines Boeing Posted Online. VIDEO