The human rights group, Elsham says five people in Indonesia's Papua province have been arrested in connection with the weekend clash in Timika which left three people dead and up to 50 injured.
Ferry Marison from Elsham says 1500 extra police are in Timika and a further 100 will be deployed to the area.
Mr Marison says fighting between supporters and opponents of government plans to split Papua into three is continuing despite Jakarta's decision to delay the process.
He says police is looking for another five people they believe instigated the conflict.
"Police call for five people indicated by police in the conflict to come to the police office to interview by the police regarding the conflict."