US issues Europe travel alert following Brussels attacks

US issues Europe travel alert
US issues Europe travel alert   

The U.S. State Department Tuesday issued a travel alert for citizens travelling to Europe following Tuesday's terrorist attacks in Brussels.

The travel alert, which expires on June 20, advised U.S. citizens to exercise vigilance when in public places or using public transportation.

"Terrorist groups continue to plan near-term attacks throughout Europe, targeting sporting events, tourist sites, restaurants, and transportation," the State Department said in a statement.

The U.S. also alerted citizens to be aware of immediate surroundings and avoid crowded places, and exercise particular caution during religious holidays and at large events.

Follow CNBC International on Twitter and Facebook.