Iraq’s military said on Thursday it was resuming operations with the U.S.-led coalition against Islamic State which had mostly halted after bases hosting U.S. troops came under rocket attacks and a U.S. drone strike killed a top Iranian commander.

A Russian-backed Syrian government offensive against the country’s last rebel enclave has caused one of the biggest waves of displacement in the nine-year-old war.

Islamic State extremists are mounting increasingly bold attacks in Syria and Iraq following their loss of territory in both countries and are planning for the breakout of their fighters in detention facilities, U.N. experts said in a new report.