A commander in the Shiiite battalion, also known as Kata’ib Hezbollah (KH) and the largest and most ruthless Iranian-trained militia fighting in Iraq and Syria, warned Americans on Sunday that they must leave Iraq or face a new war, Iran’s Fars News Agency reported. A report by the bipartisan Counter Extremism Project states, “KH earned a reputation for planting deadly roadside bombs and using improvised rocket-assisted mortars (IRAMs) to attack U.S. and coalition forces. “According to U.S. diplomat Ali Khedery, KH is responsible for ‘some of the most lethal attacks against U.S. and coalition forces throughout [the war.] The group is suspected of involvement in extrajudicial killings and abductions in Iraq’s Anbar province, including the May 27, 2016, abduction of more than 70 Sunni boys and men from al-Sijir, and the murder of 49 men from Saqlawiyah,” the project’s report stated.