Security stepped up as Australia vows transparent siege probe

A visitor looks through the barrier to the crime scene which has been turned into a makeshift memorial after a fatal siege in the heart of Sydney's financial district on December 16, 2014Australian Prime Minister Tony Abbott on Wednesday vowed a transparent probe into why a deranged Islamic gunman was not under surveillance, as security was stepped up after a fatal cafe siege to reassure people now in the grip of fear.

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