Baghdad: As the world along with Pakistan mourns the death of children killed in the dastardly carried out terrorist attack in an army-run school in Peshawar by Taliban, reports of more violence from another brutal terror group have emerged.

Islamic State militants have reportedly beheaded at least 150 women, some of them pregnant, for refusing to marry them.

Iraq's Ministry of Human Rights, in a statement released, said that the women in the western Iraqi province of Al-Anbar were attacked by the Islamic State terrorists and were later buried in mass graves in Fallujah.

"At least 150 females, including pregnant women, were executed in Fallujah by a militant named Abu Anas Al-Libi after they refused to accept jihad marriage," the statement said.

Last month, at least 50 men, women and children were executed by the IS members in a tribe massacre in the village of Ras al-Maa.

According to reports, the militants lined them up and shot them dead in public.

ISIS had also recently published a pamphlet guiding its members on how to capture, keep and sexually abuse female slaves.