Bogor – In a quick move, Bogor police arrested a man believed to have killed a member of the Islamic Defenders Force, a unit of the FPI.

"Thank God, in less than 24 hours, we successfully arrested the perpetrator," Bogor police chief Adj. Sr. Comr. Hilman said. The alleged perpetrator, Ival Reza Yulia Mahendra, alias Bolang bin Hendrawan, was arrested in his house in Cijeruk, Bogor.

Mustofa, 36, was attacked and killed when he and his friends tried to mediate between two groups involved in a brawl early on Sunday. He was stabbed in the back with a silver machete by Ival.

Mustofa, a member of the Islamic Defenders Force (LPI), a unit of the FPI, was on his way home with an entourage of 30 people on 10 motorbikes and two cars after attending a Koran reading when his group encountered an ongoing brawl between two groups.

The groups did not want FPI members, who were wearing white uniforms, to intervene in the conflict, so they attacked them.

Chairman of the FPI Bogor chapter, Muhammad Zaini, had earlier threatened the police to immediately find the murderer. "We'll let the police find the murderer," Zaini said. "If not, don't blame us if we search [for the murderer] ourselves."