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Saudi Arabia's military put on an acrobatic show of strength on Sunday as millions of Muslims began to arrive in Mecca for the annual hajj pilgrimage. The event was billed as a demonstration of the anti-terror capabilities of the Saudi armed forces, which are a key part of the American-led coalition fighting ISIS.

Members of Saudi Arabia's armed forces demonstrate their anti-terror abilities in Mecca on Sept. 28, 2014.SAUDI PRESS AGENCY / EPA