Islamic State bandits have reportedly executed 19 women for refusing to have sex with fighters.

A media official with the Kurdistan Democratic Party in Mosul, who spoke to English-language Iraqi News, said the woman were put to death for refusing "sexual jihad."

Said Mimousini told the site his sources also confirmed there's been a recent split in the ranks over payment and the distribution of captured women as sex slaves.

Tens of thousands of women and girls have been abducted by ISIS fighters and trafficked for sexual slavery, prostitution or ransom, rights groups have confirmed.

The news of the executions was met with anger by at least one politician in Canada.

"These cold-blooded murders are just the latest in a long list of unspeakable atrocities committed by ISIL's jihadist death squads on innocent civilians," Tory MP Stella Ambler said in a release.

Survivors have told horror stories of being bought, repeatedly raped then sold to other fighters up to six times.

An ISIS pamphlet, recently authenticated, indicates prices range from $75 to $172 depending on age, with children the most expensive on the list.

In some cases girls have been forced to undergo hymen reconstruction surgery so they can be re-trafficked as virgins.

Some women have been so traumatized that they have committed suicide.

"ISIS has introduced and legitimised the practice of sexual slavery on an unprecedented scale," said a report by Minority Rights Group International and the Ceasefire Centre for Civilian Rights.

One Yazidi girl told activists she was taken to Syria with 350 other girls where they were displayed and sold in the streets "as if in a chicken market."

ISIS released a video last November showing what appeared to be a sex-slave market.