German authorities say they have arrested a 31-year-old Iranian man on suspicion he was spying for Tehran on an opposition group.

Federal prosecutors said Wednesday that Maysam P., whose last name wasn't given in accordance with German privacy laws, was arrested in Berlin on Oct. 23.

He's accused of spying since December 2013 for Iran on the opposition group known as the People's Mujahedin of Iran, or MEK, which is active in Germany and elsewhere. He's suspected of researching opposition members and passing the information on to a contact in Iranian intelligence in exchange for money.

German authorities say they searched his apartment and those of five other suspects thought to have been involved in collecting information on MEK members. The investigation is ongoing.