(NBC) U.S. officials warned Americans living in or visiting Switzerland on Friday that they should be extra vigilant following a CIA tip-off that prompted the country to raise its terrorism threat level.
Swiss officials said they had information of a possible planned attack on the city of Geneva. The country's public prosecutor said it was hunting suspects linked to groups such as al Qaeda and ISIS.
The U.S. Embassy in Bern issued a statement advising Americans of steps they should take.
"In this time of elevated threat, the U.S. Embassy in Bern reminds U.S. citizens to review personal security plans, remain aware of surroundings at all times, and monitor local news stations for updates," the statement said.
"We also recommend maintaining a high level of vigilance and take appropriate steps to enhance personal security," it added.