The clashes happened in North Sumatra's Serdang Bedagai district. On Saturday, police killed four suspected members of the group and arrested two others. Then on Sunday, one suspect was fatally shot and another killed by a grenade he apparently threw during a gunbattle with police, said Maj. Gen. Oegroseno, chief of North Sumatra police. Another suspect surrendered at a local police station, said Oegroseno, who, like many Indonesians, uses only one name. Police are still searching for at least five other suspects. The group is believed behind robberies of banks and moneychangers that have netted more than $127,000 since April to buy weapons and finance acts of terror. The group is also accused of attacks on police stations that have killed three officers.