JAKARTA - A man was arrested after he was found lurking in the compound of Central Java Police Headquarters at about 1am on Tuesday (June 27).
The 31-year-old suspect from Blitar regency, in East Java, was caught with a backpack containing two knives, used syringes as well as a bunch of rusty nails.
"We were suspicious of the backpack he was carrying," said Central Java police spokesman Djarod Padakova. "Upon checking, we found several items, including sharp weapons."
Investigations are still ongoing, but the suspect, identified by his initials MR, has also been sent for a psychological examination, said Mr Djarod.
"MR claimed to have jumped over the fence (of the police station) to search for food," he added.
This latest arrest comes after two suspected terrorists stabbed and killed a policeman on Sunday (June 25), after they infiltrated a police station in Medan, North Sumatra.
The attack took place at 3am just as millions of Indonesians were about to celebrate Idul Fitri and mark the end of the Muslim fasting month of Ramadan.
Police commandos who rushed to the scene shot and killed one and injured the other after they refused to heed a warning to stop their assault. The suspect who died from gunshot wounds was identified as Ardial Ramadhana.
The police had said earlier that the wounded man, Medan resident Syawaluddin Pakpahan, had travelled to Syria in 2013 just as the Islamic State in Iraq and Syria (ISIS) was being established in the Middle East.
"He was in Syria for six months," North Sumatra police spokeswoman Rina Sari Ginting said in a Jakarta Globe news report. "This information has been confirmed by Syawaluddin Pakpahan and his wife."
Ms Rina added that the main objective of Syawaluddin and Ardial was to take hold of weapons from the officer they stabbed for future attacks on the police and troop.
A search of one of Syawaluddin's home also uncovered an ISIS flag among his possessions, indicating that he could be a supporter of the terrorist group.
Although he had returned to Indonesia, Syawaluddin is also said to have remain in communication with other fighters in Syria using the Internet.
National police spokesman Martinus Sitompul said on Tuesday that another suspect, Firmansyah Putra Yudi, has been arrested.
Firmansyah, 32, is believed to be the suspect who planned the attack in Medan. He is also the fourth man directly connected to the case.
Syawaluddin, Ardial, and Hendry Pratama alias Boboy, who was arrested shortly after the stabbing in Medan, are believed to have surveyed the North Sumatra Police Headquarters for the attack.
Mr Martinus said the suspects will be charged for terrorism, as well as premeditated murder.