Dili – Four men have been arrested in the killing of a member of Indonesia's ruling Golkar party during an election meeting in East Timor, police said Monday.

The arrests brought to six the number of men held in connection with the killing Sunday of Alsino da Costa, 29. It was the only violence on the first day of the official campaign period for May 29 general elections.

East Timor Gov. Abilio Jose Soares said anti-government activists killed da Costa when they tried to break up a ruling party meeting in Baucau, 150 kilometers east of Dili.

Police are looking for more suspects, Col. Yusuf Muharam said by phone from Dili, East Timor's capital.

Indonesia is trying to crush a separatist movement in East Timor, a former Portuguese colony invaded by Indonesian troops in 1975.