DOHUK, IRAQ -- A mysterious helicopter crash in northern Iraq has killed at least five people, allegedly including militants belonging to an outlawed Kurdish insurgency group, according to statements Thursday from the Iraqi Kurdish-run counterterrorism agency and the region's president.

The AS350 Eurocopter crashed in the district of Chamanke in Dohuk province in Iraq's semi-autonomous Kurdish region on Wednesday night, the counter-terrorism agency said in a statement posted on social media.

At least five passengers were killed, said Lawk Ghafuri, spokesperson for the government of northern Iraq's Kurdish semi-autonomous region.

"The investigations are ongoing by security officials to determine the ownership of the helicopter," Ghafuri said in a post on Twitter.

At least seven were on board, according to an investigator at the crash scene speaking on condition of anonymity to discuss the investigation with the media.

The helicopter was carrying militants belonging to the outlawed Kurdistan Worker's Party, or PKK, the counter-terrorism statement said. No party has of yet claimed ownership of the chopper.

Iraq's government, the U.S-led coalition and Turkiye had been contacted by the Iraqi Kurdish regional government about the crash, but each denied the helicopter was theirs, the statement added.

Zagros Hiwa, a PKK spokesperson, said the group does not possess helicopters and they were also investigating the incident. He also cast doubt on the presence of PKK militants onboard the flight, saying they may have a coalition helicopter carrying fighters with the People's Protection Units, or YPG, a Syrian Kurdish group allied with the U.S.-led forces.

A spokesman for the U.S.-led coalition declined to comment, saying the crash fell outside the scope of the coalition's operations.

Turkish defence ministry officials said that initial reports that the helicopter had been Turkish were "completely untrue" and that there was no helicopter flight belonging to the Turkish military in the region.

The PKK has been waging an insurgency against Turkiye since the 1980s and is considered a terrorist group by Ankara, the United States and the European Union. Its militants have established safe havens in northern Iraq and frequently come under attack by Turkiye in the region.

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Associated Press writer Salar Salim in Irbil, Iraq, contributed to this report.

Correction:

The Associated Press erroneously identified Lawk Ghafuri as a spokesperson for the Kurdish region's President Nechirvan Barzani. Ghafuri is a spokesperson for the government of northern Iraq's Kurdish semi-autonomous region.