At least 33 dead after Philippine ferry capsizes: official

At least 33 people were killed after a passenger ferry with 173 on board capsized in rough waters in the central Philippines on Thursday, a disaster monitoring official said.

Rescue boats picked up dozens of survivors who clung to the overturned hull of the Kim Nirvana, one kilometre (about half a mile) from Ormoc port, Ciriaco Tolibao from the city's disaster risk reduction and management office told AFP.

Divers were scouring the murky waters searching for survivors from the inside of the ship, he said.

A report on Manila radio said 21 people were missing. However Tolibao could not say how many were still missing or had been rescued.

The coast guard confirmed that it was engaged in search and rescue activities but could give no further details of the operation.

Poorly-maintained, loosely-regulated ferries are the backbone of maritime travel in the sprawling archipelago.

But this has led to frequent accidents that have claimed hundreds of lives in recent years, including the world's worst peacetime maritime disaster in 1987 when the Dona Paz ferry collided with an oil tanker, leaving more than 4,300 dead.