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Reuters - Innovations Video Online (Mar. 31, 2015) Kenya's military caused the collapse of three floors of Nairobi's Westgate mall during the terrorist siege in which at least 67 people died, a top-ranking government official has said.

The account comes before the release of findings from an ongoing forensic investigation into the attack and raises the possibility that the military may have killed hostages in their rescue attempt. An undisclosed number of people are reportedly buried in the rubble.

The official said autopsies will determine if any bodies found there were killed by falling debris or the attackers.

US ambassador Robert F Godec said the United States is concerned about the spectre of more violence from the Somali Islamic group, al-Shabaab, which claimed responsibility for the attack.

"Obviously they do pose a threat and it's critically important, I think, that