Papua police have identified a group suspected of supplying the ammunition used in a number of armed attacks against US-based gold miner PT Freeport Indonesia in the past month, an officer says.

Spokesman for the police, Sr. Comr. Agus Rianto, said Wednesday that investigators had also identified those allegedly responsible for the shooting incidents, which left three people dead.

"We have traced the supply line of the ammunition and identified the groups involved. Let's wait and see," Agus said to tempointeraktif.com.

Through investigations the police have concluded that the gunmen fired bullets produced by the Army-run arms producer PT Pindad in Bandung in the attacks.

"We have listed several individuals who are suspected of masterminding these acts of violence and we will hunt them down," Agus said.

The gunmen launched their latest attack Sunday, targeting a convoy of buses carrying Freeport employees. Five employees were injured by shattered glass.