PORT MORESBY: Rescuers plucked more than 230 survivors from the sea after a passenger ship sank off the east coast of Papua New Guinea, the Australian Maritime Safety Authority said Friday, CNN reported.

The Australian authorities have been helping Papua New Guinea with rescue efforts after the ship, the MV Rabaul Queen, sank about 16 kilometers (10 miles) off Cape Fortification in the Vitiaz Strait after getting into trouble early Thursday.

After an alert was sent out, boats and helicopters rushed to the scene to try to save scores of people left adrift at sea by the sinking.

Rescuers have so far recovered 238 people, said Jo Meehan of the Australian Maritime Safety Authority. Five vessels carrying them traveled to the port of Lae on the Papua New Guinea mainland.

Australia is Papua New Guinea's closest neighbor minus Indonesia, with which it shares a border.

Information from the ferry company suggested that there were about 350 aboard the boat when it sank, said Carly Lusk, a spokeswoman for the Australian Maritime Safety Authority.

"I'm pleased that a large number of people have been rescued," said Kevin Rudd, the Australian foreign minister. "We're deeply concerned about those who are still missing."

Rudd said he didn't have any information on the precise number of people missing or on the nationalities of the passengers aboard the ship.

"This is a difficult operating environment," he said. "We are doing everything within our power."

The Rabaul Queen was ferrying passengers from the town of Kimbe on New Britain Island to Lae when it got into difficulty.

Jurgen Ruh, the chief executive of Manolos Aviation Ltd. in Lae, was in one of the helicopters that helped with the rescue effort.

"I could see the survivors on the debris," he said, noting that the passenger ship had sunk completely by the time he reached the scene.

There were about 10 life rafts visible, each with roughly 10 people on them, the first time his helicopter flew overhead, he said. However, when the helicopter returned to the area after refueling, no more survivors were spotted.

The weather was likely to be a contributing factor in the ferry's sinking, Ruh said, as there were high winds at the time in what is a notorious area.

The ferry may have been full because children return to school at this time of year, he added.

Searches are expected to resume Friday morning, Australian authorities said. Strong winds are reported from the scene, with a 5-meter (16-foot) sea swell. In addition to the three vessels, four aircraft will participate.

Papua New Guinea had a population of 6.7 million in 2010, the U.S. State Department says, with about 190,000 people living in Lae. Most of the population is scattered in small settlements across the state's many islands.

The largely Christian country is part of the Commonwealth and has Queen Elizabeth II as head of state. The bulk of the estimated 2,000 American residents in Papua, New Guinea, are missionaries and their families, the State Department says.