GENEVA — The authorities in Geneva raised the city’s level of alert and deployed additional police officers on Thursday in an apparent search for terrorist suspects.

The Geneva office of security said that as part of the investigations following the Paris attacks, it had been notified by the federal authorities that “suspicious individuals” may be in the city or surrounding areas.

On the basis of that information, the Geneva police were conducting investigations, “in collaboration with national and international services,” the office said.

A spokeswoman for the Geneva security office, Emmanuelle Lo Verso, said later that Geneva’s alert level had been raised from 2 to 3 on a scale of 5. She said it was “in the context of” the Paris attacks but did not directly connect the alert with those events.