HELSINKI - Police in Finland have arrested a 24-year-old Iraqi man on suspicion of murder and war crimes related to the massacre of hundreds of Iraqi soldiers by the Islamic State group in 2014.

The Finnish National Bureau of Investigation says the suspected crimes were committed at Camp Speicher, a former U.S. base just outside Tikrit in northern Iraq. The agency said Wednesday that the suspect, who was not identified, arrived in Finland in the fall of 2015. It gave no further details.

An agency statement said it was also investigating the involvement of two brothers who are suspected of "terrorist murders" in the same massacre.

Iraq on Sunday executed 36 men convicted of taking part in the 2014 killings that took place after IS militants captured 1,700 Iraqi army soldiers.