The US State Department alerts citizens to potential risks of travel to and throughout Europe following several attacks, including the March 22 attacks in Brussels.

    Terrorist groups continue to plan near-term attacks throughout Europe, targeting sporting events, tourist sites, restaurants, and transportation. This Travel Alert expires on June 20, 2016. 

    US citizens should exercise vigilance when in public places or using mass transportation. Be aware of immediate surroundings and avoid crowded places. Exercise particular caution during religious holidays and at large festivals or events.

    On Tuesday, US media reported that police evacuated part of Denver airport terminal in response to a possible security threat.

    Homeland Security Secretary Jeh Johnson stressed there is no "specific, credible intelligence" pointing to a similar plot in America, but he said the Transportation Security Administration would deploy additional security at major airports and rail stations in different cities.

Source: QNA