An Iraqi spokesman says the country's air force has received a new batch of F-16 Fighting Falcon aircraft from the United States. He says this will bolster Iraq's fledging air force amid more than two years of fighting with the Islamic State group.

Defense Ministry's spokesman, Brig. Gen. Tahseen Ibrahim, told The Associated Press on Monday that the new batch consisted of four fighter jets.

With the new arrivals, Iraq has now eight F16s in service, out of 36 fighter jets the U.S. agreed to sell to Baghdad.

Iraq has been going through its worst crisis since summer 2014 when IS militants captured much of the country's north and the west, including the second-largest city of Mosul.

Despite major ground loses since last year, IS still controls key areas.