The prime minister of Papua New Guinea is calling for greater Australian law enforcement in the country following the alleged police shooting of two men in Port Moresby.

Tensions remained high in the capital after betel nut vendors Nicholas Rarua and Toka Gaudi were killed in Hanuabada village on Friday.

According to villagers, police fired indiscriminately into a crowd after a dispute between vendors and local council officers.

PNG prime minister Peter O'Neill called for a "thorough and independent" investigation.

Mr O'Neill, who was in Canberra for a meeting with his Australian counterpart Tony Abbott this week, said he wanted Australian Federal Police (AFP) officers to be deployed as line officers in PNG's constabulary.

"I've stressed to the Australian Government that we are willing to engage on the expansion of the AFP program," Mr O'Neill said.

"We will be looking at further development of the training at Bomana, and to get the AFP engaged as line officers in the PNG police.

"At the same time we want to increase the number of Papua New Guinea police officers coming to train in Australia.

"This could be on a twining arrangement that will enable our people to get exposure and further training in how to manage a more demanding police force that is required in our country."

Thousands of villagers have protested against Friday's killings, maintaining roadblocks around Hanuabada until their demands are met including a post-mortem on the bodies.

Health minister Michael Malabag said he was confident talks between village leaders and police would end in the roadblocks being removed soon.

PNG police commissioner Geoffrey Vaki promised an immediate investigation into the Hanuabada shooting. ( PNG Loop )

"There are a lot of issues that have to be settled," he told Radio Australia's Pacific Beat.

"At the end of the day, justice must prevail.

"That is where we are insisting the police have to complete the investigation and the people must be satisfied that those who did the killing must be brought to justice."

Police Commissioner Geoffrey Vaki said a team had been set up to investigate the incident and liaise with Hanuabada community leaders.

"It will continue until such time as evidence proves which particular members of which unit were responsible," he said.

"And if they are identified, the normal procedure is they are suspended forthwith."

PNG imposed a total ban on the sale of betel nut in Port Moresby from January 1 to counter the negative impact of betal nut chewing and spitting.