Iraqi forces have launched an operation to clear the desert bordering Syria of Isis, a final campaign to rid Iraq of the militant group, the military said in a statement.

Troops from the Iraqi army and Shi'ite Popular Mobilisation Forces (PMF) were taking part in the campaign against militants hiding in a large strip of border land, Iraqi military officials said.

“The objective behind the operation is to prevent remaining Daesh groups from melting into the desert region and using it as a base for future attacks,” said army colonel Salah Kareem, referring to Isis by an Arabic acronym.

Iraqi Prime Minister Haider al-Abadi said on on Tuesday that Isis had been defeated from a military perspective but he would only declare final victory after militants were routed in the desert.

Syrian Democratic Forces take Raqqa from Isis – in pictures Show all 8 1 /8 Syrian Democratic Forces take Raqqa from Isis – in pictures Syrian Democratic Forces take Raqqa from Isis – in pictures Syrian Democratic Forces fighters celebrate victory in Raqqa atop of military vehicles REUTERS Syrian Democratic Forces take Raqqa from Isis – in pictures Fighters of Syrian Democratic Forces march past destroyed buildings as they celebrate victory REUTERS Syrian Democratic Forces take Raqqa from Isis – in pictures Fighters of Syrian Democratic Forces gesture the "V" sign in Raqqa REUTERS Syrian Democratic Forces take Raqqa from Isis – in pictures Fighters of Syrian Democratic Forces evacuate a civilian from the stadium REUTERS Syrian Democratic Forces take Raqqa from Isis – in pictures A civilian prays after she was rescued by fighters of Syrian Democratic Forces from the stadium REUTERS Syrian Democratic Forces take Raqqa from Isis – in pictures Syrian Democratic Forces fighters ride atop of military vehicles as they celebrate victory in Raqqa REUTERS Syrian Democratic Forces take Raqqa from Isis – in pictures Syrian Democratic Forces fighters celebrate victory in Raqqa REUTERS Syrian Democratic Forces take Raqqa from Isis – in pictures A fighter of Syrian Democratic Forces celebrates in Raqqa Reuters

Iraqi forces on Friday captured the border town of Rawa, the last remaining town under Isis control, signalling the collapse of the group's “caliphate” proclaimed after it overran much of Iraq's north and west in 2014.