In the alert, the State Department cited recent incidents in France, Russia, Sweden and the United Kingdom and said Islamic State and al Qaeda "have the ability to plan and execute terrorist attacks in Europe."
US issues global travel alert due to 'increased terrorist threats'
The alert urges US citizens to follow instructions of local authorities, monitor media and other information before and while travelling, keep family members updated and have an emergency action plan ready if needed.
The State Department's previous travel alert for Europe, issued ahead of the winter holiday season, expired in February. A State Department official said Monday's alert was not prompted by a specific threat, but rather recognition of the continuing risk of attacks especially ahead of the summer holidays.
The alert expires on September 1.
Malls, government facilities, hotels, clubs, restaurants, places of worship, parks, airports and other locations are all possible targets for attacks, the State Department's alert said.
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