Philippine troops are struggling to defeat hundreds of fighters, who rampaged through Marawi on May 23 flying black flags of the Islamic State (IS) group, and have used civilians as human shields, bomb-proof tunnels and anti-tank weapons to fortify their positions.
Yesterday's ferocious, street-to-street gunbattles with the militants saw 13 troops killed, in a dramatic surge in the toll from the conflict, Philippine military spokesmen said.
It was among the heaviest fighting seen in mainly Muslim Marawi as the air force battered parts of the city with strikes to support ground troops. Some 40 marines were wounded in the gunbattles that lasted 14 hours, according to military spokesman Colonel Edgardo Arevalo.
As the conflict intensified, the US embassy in Manila said American forces were providing assistance to the Filipino troops, although it declined to give details for security reasons.
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Marawi-based military spokesman Lieutenant Colonel Jo-ar Herrera confirmed the US help, adding that the special forces were not fighting, but "providing technical support".
He told AFP yesterday's deaths amounted to the military's biggest single-day loss in the campaign.
"There were intense firefights, house-to-house gunbattles," Herrera said at a news conference in Marawi earlier, adding that the total number of government troops killed in the conflict was 58.
Over 20 civilians have been confirmed killed due to the fighting, according to the government, but the true number is likely to be higher with authorities yet to fully assess the roughly 10 per cent of Marawi still being held by the militants.
About 2,000 people are also believed to still be trapped in militant-held areas as insurgents continue to entrench themselves in the city two weeks ito the conflict, which saw them take a Catholic priest hostage, open up two jails and destroy many buildings.
Herrera said security forces were struggling to contain the fighters without causing civilian casualties.