File photo of a police raid in the Langgen village in Tegal, Indonesia Central Java.

Indonesian police say they killed six suspected militants in a gun battle Saturday that followed a failed attack in East Java.

National police spokesman Martinus Sitompul said the men were cornered in a village of Tuban district after attempting a drive-by shooting of a police officer who was patrolling a busy road in the area.

He said the six had refused appeals to surrender during a standoff that lasted several hours, and sparked the gun battle with mobile brigade and counter-terrorism police by throwing explosives. The previous day, counter-terrorism police arrested three suspected militants who were planning to attack a police station in East Java.

Muslim-majority Indonesia has carried out a sustained crackdown on militants since the 2002 Bali bombings by al-Qaida-affiliated radicals that killed 202 people, mostly foreigners.

New threat

A new threat has emerged in the past several years from ISIS sympathizers.

Sitompul said police are investigating whether the six men were part of Jemaah Anshorut Daulah, an umbrella group of Indonesian extremists that was formed in 2015 and claims allegiance to ISIS.

Police said they seized dozens of rounds of ammunition, several firearms, knives, terror-related propaganda material and a car used by the men.