A soldier from the the Philippines Army's 2nd Mechanized Infantry Division fires a rocket launcher towards the positions of members of the Bangsamoro Islamic Freedom Fighters (BIFF) militants during clashes in Maguindanao, Philippines July 4, 2018. Philippine soldiers backed by armoured vehicles have retaken a southern town held for 12 hours by pro-Islamic State militants, the army said on Wednesday, with four rebels killed in urban clashes reminiscent of a five-month siege last year. Sgt Christian Santos/33rd IB/6th IB/Armed Forces of the Philippines/Handout via REUTERS

Soldiers from the Philippines Army's 2nd Mechanized Infantry Division fire mortars towards the positions of members of the Bangsamoro Islamic Freedom Fighters (BIFF) militants during clashes in Maguindanao, Philippines July 4, 2018. The clashes followed warnings by President Rodrigo Duterte that remnants of pro-Islamic State militant groups had been recruiting and still planning attacks on several southern cities to set up an independent and separate Islamic state. Sgt Christian Santos/33rd IB/6th IB/Armed Forces of the Philippines/Handout via REUTERS

Soldiers from the the Philippines Army's 2nd Mechanized Infantry Division take positions during clashes with members of the Bangsamoro Islamic Freedom Fighters (BIFF) militants during clashes in Maguindanao, Philippines July 4, 2018. Troops pursued militants from the Bangsamoro Islamic Freedom Fighters (BIFF) group, who fled to the hills after trying to occupy a marshland town, Lieutenant-Colonel Harold Cabunoc, an army battalion commander, said in a statement. Sgt Christian Santos/33rd IB/6th IB/Armed Forces of the Philippines/Handout via REUTERS

A soldier from the Philippines Army's 2nd Mechanized Infantry Division takes up a position during clashes with the Bangsamoro Islamic Freedom Fighters (BIFF) militants in Maguindanao, Philippines July 3, 2018. Hundreds of residents have remained in shelter areas and not been allowed to return home after troops retrieved improvised explosive devices and other booby traps in the town of Datu Paglas. Sgt Christian Santos/33rd IB/6th IB/Armed Forces of the Philippines/Handout via REUTERS

Soldiers from the Philippines Army's 2nd Mechanized Infantry Division take up positions during clashes with the Bangsamoro Islamic Freedom Fighters (BIFF) militants in Maguindanao, Philippines July 3, 2018. Cabunoc said four Islamist militants were killed and two others were wounded. A soldier and a local militia official were also wounded. The army said the Datu Paglas attack could be a test case, since the area was near the militants' marshland base. Sgt Christian Santos/33rd IB/6th IB/Armed Forces of the Philippines/Handout via REUTERS

Soldiers from the Philippines Army's 2nd Mechanized Infantry Division carry their weapons after they have retaken the camp of the Bangsamoro Islamic Freedom Fighters (BIFF) militants in Maguindanao, Philippines July 3, 2018. Sgt Christian Santos/33rd IB/6th IB/Armed Forces of the Philippines/Handout via REUTERS