(VOVworld) - The United States has issued a global travel warning after recent terror attacks in France, Australia and Canada.

The alert comes just hours after French police killed three hostage-takers in a pair of incidents. The State Department's warning says attacks against Americans are becoming increasingly prevalent. It also cites an increased risk of reprisals against US and Western targets for the US-led intervention against Islamic State militants in Syria and Iraq. The warning also cited last month's hostage standoff at a Sydney cafe and the October killing of a soldier near Canada's parliament.