Bayu Marhaenjati – A simmering turf war exploded again late on Sunday when a Pancasila Youth post in Cengkareng, West Jakarta, was attacked by suspected members of a rival group, leaving one person injured.

A convoy of motorcycles surrounded the post on Jalan Bangun Nusa Raya at 9:45 p.m. on Sunday and about 20 people vandalized the building and injured the guard, 25-year-old Pancasila Youth member Arif Hidayat. Arif was struck with blunt objects but his current condition is unknown.

"Arif Hidayat was the lone victim," Cengkareng Police Chief Comr. Rudy Reinewald said on Monday. He would not speculate about the possible identity or motives of the attackers.

The attack came days after the murder of 36-year-old Muhidin, a member of the Betawi Brotherhood Forum (FBR), at the FBR headquarters in Ciputat, Tangerang.

The Jakarta Police said on Friday that they wanted to talk to a local Pancasila Youth leader, Riki Oktario, and eight other people about Muhidin's murder.

Clashes between Pancasila Youth and the FBR are common and often involve control of turf and illegal parking areas. Last August, dozens of FBR members clashed with Pancasila Youth members on Jalan Margonda Raya, which dissects South Jakarta and Depok.

There have been reports that the FBR has been involved in a series of retaliatory attacks on people believed to be connected to Pancasila Youth following Muhidin's murder. Hundreds of alleged FBR members armed with Molotov cocktails and other weapons last week burned down the house of Tangerang councilor Karnadi, a Pancasila Youth supporter.

Tensions between the groups could escalate in the run-up to Jakarta's gubernatorial election on July 11. The FBR is backing the current governor, Fauzi Bowo.

Pancasila Youth is headed by Yapto Soerjosumarno, a family friend of the late President Suharto, a Golkar Party figure. Golkar has nominated South Sumatra Governor Alex Noerdin as its candidate for the Jakarta election.