MOSUL – ISIS militants killed 42 civilians in Mosul after they refused to join the terror group, a parliamentary source from Nineveh province said.

“The militants in Mosul are looking for women to get them involved in the so-called jihadul Nikah [sexual jihad],” the source said. “ISIS kills whoever refuses to join.”

“ISIS executed 42 men who refused to join the group in Mosul,” the source added.

Earlier on Saturday, ISIS was reported to have killed 15 civilians in western Mosul for refusing to allow the group’s snipers to position or erect rocket launchers above their residences, Nehal Mostafa at Iraqi News reports.

ISIS executed hundreds of civilians and security members since it took over large areas in Iraq to proclaim a self-styled “Islamic Caliphate” in 2014.

ISIS has been losing ground and personnel since Iraqi government forces, backed by a U.S-led coalition and paramilitary troops, launched an offensive in October 2016 to recapture Mosul, the second-largest Iraqi city and the militants’ last urban stronghold in the country. The U.S.-led coalition had estimated the number of remaining IS militants in Mosul by less than 1000.

Eastern Mosul was retaken in January after three months of fighting. A new offensive was launched in February to retake the west.

Over four million persons were displaced inside the country since emergence of ISIS in 2014.

Iraqi troops currently control 2500 sq. miles of the city, the U.S. State Department tweeted on Friday.