DHAKA: Islamic State of Iraq and Syria (ISIS) fighters have seized a Syrian army base in the northern province of Raqa, killing scores of troops and beheading some of them.

A monitoring group said on Saturday, reports The Straits Times.

The takeover of Division 17 base came as the UN Commission of Inquiry on Syria said on Friday that ISIS fighters accused of atrocities would be added to a list of war crimes indictees.

In a two-day assault on the base in Raqa province, an IS bastion, the jihadists killed at least 85 soldiers, said the Syrian Observatory for Human Rights.

More than 50 troops were summarily executed, 19 others were killed in a double suicide bombing and at least 16 more died in the assault launched early Thursday.

BDST: 2038 HRS, JUL 26, 2014