The US State Department is warning Americans to the "heightened risk of terrorist attacks" at "soft targets" throughout Europe.
Fears of potential terror attacks on Europe's Christmas markets and other sites have prompted a warning for US tourists heading overseas for the holidays to be on alert.
The US State Department has warned Americans to the "heightened risk of terrorist attacks" at "soft targets" throughout Europe, including the UK.
The travel alert cited recent massacres in London, Manchester and Barcelona, as well as last year's deadly truck attack on Berlin's Christmas market.
It warned that terror groups such as ISIS or their sympathisers or self-radicalised extremists are capable of planning and executing atrocities in Europe.