A Swiss official says Geneva police are hunting for at least four suspects believed to have links to the radical Islamic State group and are believed to have been plotting a specific attack in the city.

The official says the CIA alerted Swiss authorities to the four men on Wednesday — prompting the manhunt. He spoke to The Associated Press on Thursday on condition of anonymity because of the sensitivity of the matter.

The official also confirmed the suspects were four men shown in a photograph linked to a news report in the Swiss daily Le Matin. They were pictured each in a crouched pose and holding up an index finger.

He said the suspects were not believed to have had direct links to the Paris terror attacks, appearing to revise an earlier statement from the Geneva security department.

The official also said it was too early to say whether other suspects might be at large.