Finnish police say they have arrested an Iraqi man suspected of war crimes in his home country last year.

Detective Superintendent Jari Raty says the 23-year-old man is suspected of being involved in war crimes in Tikrit while fighting on the side of Iraqi forces when they recaptured the city from the Islamic State group in April 2015. Raty did not specify the nature of the alleged crimes or give further details about the suspect pending the outcome of an investigation.

Raty, who heads of the National Bureau of Investigation's probe, said the arrest was in line with Monday's decision by the Pirkanmaa District Court in Tampere. Police have until March 15 to bring charges against the suspect or release him.