Philippine officials said Isnilon Hapilon, Daesh's "emir" in Southeast Asia and Omarkhayam Maute, one of two Middle East-educated "Khalifas" at the helm of the militant alliance, have been killed.
Although Daesh's influence in the southern Philippine city is on wane, the group still poses a significant security threat to all of Southeast Asia
The Philippine army says hostages in the southern city are being forced to fight and ferry wounded militants as the battle with a pro-Daesh group holed up in Marawi enters its sixth week.
The governments of the Philippines, Indonesia and Malaysia met as the siege of Marawi City by the pro-Daesh Maute group continues into its fifth week.
The military disputes the group's claims that fighters held two-thirds of the southern city. The offensive to take back Marawi from pro-Daesh Maute militants has been going on for more than three weeks.
The Philippines military confirms the US is providing technical assistance, but it had no boots on the ground. Thirteen Philippine marines conducting clearing operations have been killed in the battle for Marawi city, a military spokesman said.
The Phillipines' president has offered $410,000 for the "neutralisation" of Isnilon Hapilon, Abdullah Maute and his brother Omarkhayam Maute. The three are said to be the leaders of the militants fighting troops in Marawi.
Up to 2,000 civilians are trapped in Marawi as the military assault against the Daesh-linked Maute group continues for the eighth day.
The violence that began last week has killed dozens. Though most people have left, those still trapped are worried about being intercepted by militants at checkpoints on routes out of the city.
Daesh-linked Maute militants targeted the civilians in the mainly-Muslim city of Marawi on Mindanao island raising the death toll to 85 since the fighting began five days ago, military officials say.
Daesh-linked militants laid siege to the mainly-Muslim city of Marawi, prompting President Rodrigo Duterte to impose martial law on the area. He threatens to expand it to the rest of the Philippines if militant activity continues.
Officials accuse Daesh-linked militants of abducting a Catholic priest and more than a dozen churchgoers in Marawi, the capital of the island of Mindanao, where martial law was imposed on Tuesday.
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