First Look ISIS-linked militants lay siege to city in southern Philippines, Duterte declares martial law

The attack is taking place in Marawi, a mostly Muslim city of 200,000 people on the southern island of Mindanao.

Romeo Ranoco/Reuters

Islamic State group-linked militants swept through a southern Philippine city, beheading a police chief, burning buildings, seizing a Catholic priest and his worshippers and raising the black flag of IS, authorities said Wednesday. President Rodrigo Duterte, who had declared martial law across the southern third of the nation, warned he may expand it nationwide.