Australia said Tuesday a week-long protest by asylum-seekers at one of its immigration detention centers had been broken up with six people injured.

Refugee activists said hundreds of would-be refugees at the Christmas Island compound, about 2,600 kilometers (1,612 miles) from the western city of Perth, were refusing food. They claimed seven had sewn their lips together.

A fresh 6.1-magnitude tremor rattled Papua New Guinea's Bougainville island Sunday as officials scrambled for news of damage and casualties following a powerful earthquake overnight that sparked a tsunami alert.

The 7.5-magnitude quake struck 75 kilometres (47 miles) southwest of the town of Panguna on Bougainville at a depth of 30 kilometres around 11:30pm local time on Saturday.

A powerful earthquake with a magnitude of 7.5 struck off Papua New Guinea late Saturday, the U.S. Geological Survey said.

A tsunami warning was issued for Papua and the Solomon Islands by the Hawaii-based Pacific Tsunami Warning Center, but it later cancelled the alert.

A strong 6.6-magnitude earthquake struck off Papua New Guinea's Bougainville Island Saturday but there was no risk of a widespread tsunami, seismologists said.

The quake, scaled back from an initial reported magnitude of 6.9, hit at 0104 GMT and was centered 59 kilometers (36 miles) southwest of the town of Panguna on Bougainville at a depth of 24 kilometers, the U.S. Geological Survey said.

A powerful 7.3-magnitude earthquake struck off Papua New Guinea on Friday, U.S. officials said, but no Pacific-wide tsunami warning was sounded.

The U.S. Geological Survey said the quake hit at an estimated depth of 54 kilometers (34 miles) at around the same distance west of the town of Panguna on the remote and volcanic Bougainville island.

 One person was killed and 77 injured as tensions boiled over during a second night of violence at an Australian immigration detention center on Papua New Guinea's Manus Island, officials said Tuesday.

Thirty-five asylum-seekers broke out of the same facility on Sunday evening, with several hurt, as unrest flared about their fate under the Australian government's hardline policies.

Thirty-five asylum-seekers broke out of an Australian immigration detention on Papua New Guinea's Manus Island and several were injured, officials said Monday, as tensions mount about their fate under hardline policies.

Australian Immigration Minister Scott Morrison said the asylum-seekers escaped Sunday evening but were quickly rounded up by private security contractors at the facility, one of two remote Pacific camps used in Canberra's punitive off-shore detention policy.

Australia's human rights watchdog launched an inquiry Monday into the detention of children under punitive government policies banishing asylum-seekers who arrive by boat to remote Pacific camps.

Gillian Triggs, president of the Australian Human Rights Commission, said the probe would examine the impact of mandatory detention on more than 1,000 asylum-seeker children being held in immigration facilities in Australia and the more than 100 on far-flung Nauru.

A proposal by Niue Premier Toke Talagi for his small Pacific nation to house asylum-seekers to Australia has been rejected by the Niuean parliament.

About 1,700 asylum-seekers who took people-smuggling boats to Australia are being held in camps on Papua New Guinea and the Pacific island of Nauru under a deal with Canberra.

Australia has damaged its human rights record by persistently undercutting refugee protections, including a "draconian" policy to send asylum-seekers to Pacific island camps, Human Rights Watch said Wednesday.

In its annual World Report, the group said successive Australian governments had prioritized domestic politics over international legal obligations towards asylum-seekers, who faced "draconian new policies in Australia" diverting them to third countries.