The police special anti terrorist squad (Densus) 88 arrested five suspected terrorist in the district of Blitar on Wednesday.
Blitar district police chief Adj. Sr Com. Anissullah M. Ridha said the plan was known from the notes written by the suspects.
"There are a number of notes we found and one of them is about plan to attack police headquarters including a police station at Talun and a bank," Anissullah said here on Thursday.
The notes were found in a raid on Wednesday night in three places by a team of the Special Anti Terrorist Squad (Densus) 88 of the State Police Headquarter in Jakarta.
Densus 88 arrested the five suspects in thre-e separate places including three in the sub-district of Talun, one at the sub-district of Gandusari and one at the sub-district of Wlingi.
In a raid of the house of a suspect NH, who was a physician, in the sub-district of Talun police found a firearm with 8 bullets and a number of books about jihad.
The suspects resisted arrest but they were easily overcome by the special police force. The five men had been brought to Surabaya for further investigations.
Anissullah said police had tightened security control after the arrest of a number of other suspects including one Syamsul Arifin (37) nabbed recently in the village of Jatinom, also in the district of Blitar.
Syamsul, alias Abu Umar alias AU, is the chairman of the East Java, branch of suspected terrorist organization Jamaah Ansharut Daulah (JAD) arrested early last month.
Syamsul is charged with involvement in the attacks of three Christian churches and police headquarter in the East Java capital of Surabaya early last month leaving scores of people including nine of suicide bombers killed.
Six attackers of the three Churches belonged to family - father, mother, two daughters and two sons and four attackers of the police headquarter also belonged to another family all killed in the suicide bombing attack.
Anissullah said police had tightened security control in East Java after the attacks especially during Ramadan.
He said the five suspects , based on their identity cards, were from the Blitar.