SYDNEY - Four people have been arrested over the brutal killings of the four Chinese in Papau New Guinea's capital of Port Moresby, local newspaper The National reported on Thursday.

However, Wang Yanbo, a Chinese diplomat in Papua New Guinea, told Xinhua the news has yet to be confirmed.

Four Chinese were stabbed to death by masked criminal in a bakery on Monday night.

Papua New Guinea's Prime Minister Peter O'Neill on Wednesday condemned the killing and called the attack "brutal and cowardly," while saying an investigation is underway.