The terror threat in Europe is still at a high enough level for the United States to keep a travel advisory in place for Americans traveling there.

Britain's terror threat level remains at "severe," meaning an attack is very likely.

Earlier this month, the State Department advised Americans traveling in Europe to use extreme caution, following reports that terror plots may be underway.

The U.S. travel advisory is currently one step below a formal travel warning advising Americans not to visit Europe.