US joins fight; 13 marines killed

United States special forces are providing support to the Philippine military battling to dislodge Islamist militants in a southern city, the US embassy said yesterday, as 13 Filipino marines were killed in fresh fighting.

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.

Friday'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.

A 15-year-old boy was also killed by a stray bullet as he took part in Friday prayers at a mosque in Marawi as the skirmishes raged outside, an AFP video journalist 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.

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".