Hundreds of militants, who have been flying the black flag of so-called Islamic State and are led by the self-styled IS emir of the southern Philippines, Isnilon Hapilon, and the Maute brothers Omar and Abdullah, are still holed up in the city.
Thirteen Philippine marines have been killed in a gun battle with Islamist militants as troops step up an offensive to regain control of a southern city besieged by the terrorists for nearly three weeks.
Military spokesman Col. Edgard Arevalo says the marines were killed in daylong close-quarter combat on Friday.
Forty other marines were wounded, Herrera said.
At least 138 militants and 20 civilians have also been killed, the government said.
"The local terrorist groups are using the mosque; they are entrenched there".
Both Maute and Abu Sayyaf have declared their allegiance to ISIL.
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The Armed Forces of the Philippines have been slugging it out with Maute militants for control of Marawi, in the southern Mindanao region of the Philippines.
"We are saddened with the result.We have fatalities on the government side", he said.
Herrera, however, did not say when the terrorists were killed and in which specific operation.
They initially estimated there were about 100 gunmen but later said there were as many as 500, supplemented by foreign fighters from Chechnya, Saudi Arabia and Yemen. At the moment, no USA soldiers have been deployed but according to reports on site, a US P3 Orion surveillance aircraft has flown over the area. "They are just providing technical support", military spokesman Lieutenant Colonel Jo-Ar Herrera told a news conference in Marawi City. That followed sightings on Friday of a US P3 Orion surveillance aircraft over Marawi.
It would not go into operational details but said the United States forces were helping at the request of the Philippine government.
About 40 foreigners have fought alongside the Philippine militants in Marawi City, majority from Indonesia and Malaysia, though some came from the Middle East.
But Herrera denied that the U.S. troops are not joining Filipino soldiers in the fighting on the ground.
The little-known Maute group has been a fierce enemy of a military with superior firepower and greater troop strength.