SAN FRANCISCO (CBS SF) — The State Department issued a travel alert to United States citizens due to increased terrorist threats on Monday.

Bay Area travelers should anticipate additional security screening at airports and other public places.

“U.S. citizens should exercise vigilance when in public places or using transportation,” the alert said. “Be aware of immediate surroundings and avoid large crowds or crowded places. Exercise particular caution during the holiday season and at holiday festivals or events.”

The State Department said the U.S. is exchanging information with allies about threats of international terrorism.

The travel alert is in effect until February 24.

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