The Iraqi military reported Monday it found some 100 decapitated bodies in a mass grave south of the Islamic State-held city of Mosul.

Soldiers found the bodies near an agricultural college in the town of Hamam al-Alil, according to the spokesman for the Joint Military Command, Brig. Gen. Yahya Rasool. Most were reduced to skeletons.

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A forensics team from Baghdad was set to investigate the site. Rasool said the state of the bodies made it difficult to tell by their clothes whether they were soldiers or civilians.

ISIS has carried out several massacres since it swept into northern and central Iraq in the summer of 2014, often documenting them with photos and videos circulated online.

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Iraqi forces launched a massive operation last month to drive the extremists from Mosul and surrounding areas.

The terror group and related fighting has forced more than 3 million Iraqis to escape since 2014. As many as 33,000 have left Mosul, senior Obama administration officials said Monday, adding that the figure was lower than expected.

Baghdad officials said separate attacks in different suburbs of the capital have killed at least 14 people and wounded 43 others. Police said the deadliest among Monday's attacks unfolded in Arab Jabour in southern Baghdad when two mortar rounds landed in a residential area, killing four civilians and wounding 11 others.

In the western suburb of Abu Ghraib, three roadside bombs hit an Iraqi army patrol, killing an officer and two soldiers and wounding eight troops, police added. Other attacks targeted anti-ISIS Sunni tribal fighters, a checkpoint and two outdoor markets.

Medical officials confirmed the casualty figures. All officials spoke on condition of anonymity as they were not authorized to release information.

Fox News' Lucas Tomlinson and The Associated Press contributed to this report.