Indonesian police have secured a fourth bomb after suicide bombers attacked three churches. (Photo: AFP)

JAKARTA, May 13 (Xinhua) -- Indonesian police killed four terror suspects in West Java province's Cianjur regency on early Sunday, saying they had planned to undertake attacks in capital city and Bandung. 

Those four terrorists were killed in a shoot-out with police detectives in a Cianjur bus terminal. Police have been tailing them from the province's city of Sukabumi. 

"Police confiscated fire arms, bullets, bows and arrows," Indonesian police headquarters Spokesperson Setyo Wasisto told a press conference. 

Those killed terrorist suspects were members of Jamaah Ansharut Daulah (JAD) terror group.

Police found out that those killed suspects intended to launch series of attacks on police stations, police on duties in Jakarta and Bandung and also police mobile brigade headquarters in Depok, West Java. 

Also on Sunday, bomb blasts occurred in churches located in East Java province's capital of Surabaya, causing casualties.