Obama: Malaysia Airlines jet shoot-down an 'outrage of unspeakable proportion'

Kiev, Ukraine (CNN) - President Barack Obama warned Friday of a difficult, murky and complicated investigation into the apparent downing of Malaysia Airlines Flight 17, calling the shoot-down an "outrage of unspeakable proportions" and scolding Russia for training and equipping rebels who U.S. intelligence agencies say appear responsible for the attack.

In the administration's strongest words yet on the downing of the jet, which left 298 people dead, Obama said the pro-Russian fighters couldn't have shot down Flight 17 or other Ukrainian military aircraft recently downed in the region "without sophisticated equipment and sophisticated training, and that is coming from Russia."

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