The US has warned that the Euro 2016 football championship being held in France next month could be a target of militant attacks.
The State Department said that the large number of tourists visiting Europe in the summer months will present greater targets for terrorists.
The event is being hosted from 10th June to 10th July at various venues.
France is already under a state of emergency following last year's Islamist-claimed attacks in Paris.
The near-simultaneous assaults on a stadium, concert hall, bars and restaurants left 130 people dead and many more wounded.