Philippine President Rodrigo Duterte declared martial law on the southern island of Mindanao on Tuesday, as Philippine security forces battle ISIS-linked militants on the island.

Duterte issued the statement from Moscow, where he is currently amid an official state visit.

On Tuesday morning, Philippine forces conducted a raid against Islamic militants in Marawi City, the capital of Lanao del Sur Province on Mindanao, in an attempt to capture Isnilon Hapilon.  Hapilon has been the leader of the Islamic State in Southeast Asia, also known as the Maute Group, since pledging his allegiance to the terrorist organization in 2014.

The ensuing battle saw at least one police officer and two soldiers killed, as well as a dozen others wounded.  The ISIS-linked fighters were believed to be domestic terrorist hold overs from a long-standing Muslim separatist group bolstered by foreign fighters entering the country to conduct terror operations under the ISIS flag.

During the fighting, as many as 50 gunmen from the Islamic extremist camp entered Marawi City, which has a population of about 200,000, and began burning buildings, businesses, and people’s homes in an effort to “sow confusion during the fighting,” Lt. Gen. Eduardo Ano, the armed forces chief of staff, told the media.

Some of the extremists managed to establish a loosely fortified position near one of the city’s hospitals, raising the flag of the Islamic State as fighting continued elsewhere in the city.

“The whole of Marawi City is blacked out,”said Philippine Defense Secretary Delfin Lorenzana. “There is no light, and there are Maute snipers all around.”  As a result, the Philippine troops have been ordered to hold their positions until reinforcements can arrive on Wednesday.

Among the buildings said to be destroyed by the ISIS fighters already in the fighting are a church, the city jail, a school, a college and a number of homes, according to Lorenzana’s statements.