("UPDATE: Fifteen Arrested Over Indonesian Papua Attack - Police," at 0943 GMT, misstated the number of arrested people in the headline and lead paragraph. The correct version follows:)

TIMIKA, Indonesia (AFP)--Fourteen people have been arrested over a series of deadly ambushes near a giant Freeport gold and copper mine in Indonesia's Papua province, police said Tuesday.

Six of them were being investigated on weekend ambushes that killed an Australian mine technician Drew Grant, 29, and two Indonesians, provincial police chief Bagus Ekodanto said.

"We are investigating them on their involvement in any of the shootings," he added.

Eight other detainees included the alleged gunman who opened fire on the security convoy on July 12, killing a Freeport security guard, Ekodanto said earlier. A policeman who escaped the ambush was found dead in a ravine the following day.

"We arrested eight people...one carried out the shooting and the other carried ammunition," he added.

"We are still investigating the other six."

Police have also retrieved hundreds of bullets, which were made for rifles and revolvers, from the scene.

Ekodanto refused to name the suspects or say whether they belonged to the separatist Free Papua Movement.

The attack was one of several military-style ambushes on Freeport and police vehicles on the road between Timika town and the Grasberg mine that killed three people earlier this month.

A day earlier gunmen had ambushed a Freeport vehicle on the same road, killing an Australian project manager at Grasberg, which is owned by the local subsidiary of U.S. company Freeport-McMoRan Copper & Gold Inc. (FCX).

Ekodanto said police weren't "yet" linking the two attacks on July 11 and 12, although they took place within a short distance from each other on the same road leading to the mine.

Military chief Gen. Djoko Santoso has blamed separatist rebels for all of the attacks, but police have said there is no indication that is the case.

Senior officials have said ex-soldiers or police could have been involved as part of a dispute over control of access to lucrative illegal mining operations using tailings from Grasberg.

Defense minister Juwono Sudarsono has even suggested the involvement of foreign countries that have an "interest in destabilizing Freeport."

The Grasberg mine sits on the world's largest gold and copper reserves and is a lightning rod for discontent over rule from Jakarta, which took control of the eastern Papua region in 1969 in a U.N.-backed vote widely seen as rigged.

Papua is the scene of a long-running separatist insurgency by poorly armed local guerrillas who have reportedly denied killing the Australian.

Indonesia refuses to allow journalists and foreign aid agencies free access to the resource-rich area, citing fears they will "agitate" over issues such as human rights abuses by the Indonesian military.