JAKARTA, March 14 (Xinhua) -- Indonesian police have arrested five alleged members of terrorist cells affiliated to the Islamic State group in Sumatra Island of Indonesia, police officers said on Thursday.

A man alias Abu Riky was arrested in Riau province, two men and two women were nabbed in North Sumatra province, the police said.

All the suspects were detained after the police got information from terrorist suspect Abu Hamzah who was captured in Sibolga town of North Sumatra province earlier on Tuesday, police spokesman Brigadier General Dedi Prasetyo said.

Abu Riky was involved in propaganda activities of outlawed Jemaah Anshorut Daulah (JAD), which pledged allegiance to the IS network, the spokesman said.

Two other men with initials AK alias Ameng and P alias Ogel were nabbed in Sibolga town, he said.

The two women with initial of R and M were members of Sibolga network which is also loyal to the IS group, chief of North Sumatra police Inspector General Agus Andrianto said.

The police seized assembled bombs and 300 kg explosives at Hamzah's house in Sibolga.