US issues rare worldwide travel alert, cites Sydney's 'lone-wolf attack'

Updated December 20 2014 - 2:13pm, first published 11:22am
It is only the second time the US has issued a global travel alert.
It is only the second time the US has issued a global travel alert.

The US has issued a rare global travel alert to its citizens about the threat of a terrorist attack, citing Sydney's "lone-wolf attack" in which two people died after a gunman held 17 people hostage in a city cafe.

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