Unidentified gunmen in Indonesia's Papua province have shot dead three contract workers bound for the Freeport mine which is at the centre of a strike entering its second month.
The three were reportedly part of a contingent brought in to keep the mine operating as an estimated 8,000 workers remain on strike to get significant pay increases.
The incident comes less than a week after police shot dead a striking worker.
The President Susilo Bambang Yudhoyono has demanded that punishments be handed down to those police who fired the fatal shots.
Freeport is the world's most profitable mine and Indonesia's top tax payer.