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.