The FBI has warned police departments in California that Iran may retaliate against the U.S. by launching drones at the country's west coast.

FBI memo warning that Iran may try to launch drones at California in a seaborne "surprise attack" raised concern Wednesday — but officials tell CBS News there is no known, specific threat underpinning it.

Editor's note: The FBI has posted a fuller version of its alert to California authorities, which includes that the information was unverified. The latest version of this story has been updated with the full statement. The FBI warned police departments in ...

Federal authorities are warning people to be aware of restrictions on when and where drones can be operated during the upcoming FIFA World Cup games in Seattle.

Witnesses have spotted a cluster of what appear to be drones — larger than those typically used by hobbyists — as well as a possible fixed-wing aircraft flying in several areas along the Raritan River in New Jersey since Nov.

San Diego Mayor Todd Gloria said there are “no known threats to San Diego” and that its police department is coordinating with regional, state and federal partners.

The Federal Bureau of Investigation is using drones on United States soil for surveillance purposes, the agency's director, Robert Mueller, told a Senate committee today. "Our footprint is very small, and we have very few and of limited use, and we're ...