Philippine security forces says 89 gunmen killed during urban battle

Clashes erupted on Tuesday last week, when gunmen waving black flags of the IS group

Philippine security forces have killed 89 Islamist militants during more than a week of fighting in a southern city but the gunmen are still offering strong resistance and holding hostages, the military said today.

Attack helicopters fired rockets repeatedly today morning into the pockets of Marawi city where the militants were hiding among trapped residents, according to an AFP reporter who was following troops searching houses.

The clashes erupted on Tuesday last week when gunmen waving black flags of the Islamic State (IS) group rampaged through the mostly Muslim-populated city in response to an effort by security forces to arrest a Filipino on the US government's list of most-wanted terrorists.

That militant leader, Isnilon Hapilon, escaped but he was still believed to be in Marawi, military spokesperson Brigadier-General Restituto Padilla said today.

89 militants had been killed in the efforts to reclaim the city and find Hapilon, Padilla told reporters.

He said the military was making "very positive" progress towards ending the crisis, which had also seen 21 security forces and 19 civilians killed.

However Padilla acknowledged there were many residents still trapped in the 10% of the city that the gunmen were controlling, and that troops would likely meet increasingly strong resistance there.

"That 10% is most likely the area that is heavily guarded and defended by any armed men if they are protecting any individual of high value," Padilla said.

Padilla said he did not know how many militants remained.

He said they had been reinforced by prisoners who escaped from two jails during the initial rampage, and "sympathisers" of the militants.

There were more than 2,000 residents still trapped in areas of Marawi held by the militants, Zia Alonto Adiong, spokesperson for the provincial crisis management committee, told AFP.

The militants also took a priest and up to 14 other people hostage at the start of the crisis.

A video of the priest appeared on social media yesterday in which he repeated the militants' demands to withdraw, and said the militants were holding 240 people hostage.

"The video may seem to be authentic," Padilla said, although he cautioned military technology experts were still verifying it.

Padilla also emphasised the video was being used for propaganda, that the priest was speaking under duress and he did not know if the figure about the number of hostages was correct.

President Rodrigo Duterte declared martial law across the entire southern region of Mindanao, home to roughly 20 million people, in response to the crisis.

He said the Marawi violence showed that local militant groups were uniting behind IS and becoming a major security threat across Mindanao.