16:42:00
The US has issued a worldwide travel alert for its citizens due to "increased terrorist threats".
"Current information suggests that ISIL (another name for Islamic State), al Qaeda, Boko Haram and other terrorist groups continue to plan terrorist attacks in multiple regions," the State Department said.
"These attacks may employ a wide variety of tactics, using conventional and non-conventional weapons and targeting both official and private interests."
It cited recent attacks in Denmark, France, Mali, Nigeria and Turkey.
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"US citizens should exercise vigilance when in public places or using transportation," the statement added.
Americans were also advised to avoid large crowds or crowded places and to "exercise particular caution during the holiday season".
The travel alert will be in place until 24 February.
It follows simultaneous attacks at several locations in Paris that killed 130 people, and a hotel siege in which 19 people died in Mali .
Brussels spent much of the last few days in lockdown due to an "imminent" terrorist threat.
"Extremists have targeted large sporting events, theatres, open markets and aviation services," the alert added.
The State Department said "the likelihood of terror attacks will continue as members of ISIL/Daesh return from Syria and Iraq".
The US regularly issues individual country travel alerts, but worldwide alerts are rare.
