The Philippine military believes it may have ‘neutralised’ the remnants of an alliance of pro-Islamic State militants, after the suspected death of the group's de facto leader during clashes last week.

Forensic tests were being carried out to determine if one of four rebels killed on Thursday was Abu Dar, who security forces believe has led Dawla Islamiya, an alliance of pro-Islamic State fighters, foreign and Filipino, drawn from armed groups in the volatile Mindanao region.

Four soldiers were also killed during the fighting in Lanao del Sur province, which Islamic State claimed responsibility for on the mobile messaging service Telegram.

Regional army commander, Colonel Romeo Brawner, told ABS-CBN News that the death of Abu Dar would mean Dawla Islamiya had been ‘neutralised’.

Dawla Islamiya in 2017 occupied southern Marawi City for five months before its core leaders were reported killed by the military in air strikes and street battles, among them Isnilon Hapilon, Islamic State's anointed leader in Southeast Asia. Abu Dar was seen in seized video footage sitting beside Hapilon.

If confirmed, his death would represent rare progress at a time of heightened alert across the areas of Mindanao.

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