Rescuers continue searching for survivors as the government scales back operations in open waters.

At least one person has died and more than 30 remain missing after a ferry sank off the coast of Vanuatu, Prime Minister Jotham Napat’s office has said in a statement.

The MV Matui, an inter-island ferry, sank in bad weather on Friday while sailing between the islands of Ambae and Santo, in Vanuatu’s north, according to New Zealand’s public broadcaster RNZ.

Of the dozens of crew members and passengers on board, 15 have been accounted for alive, Napat’s office said in a statement posted on Facebook, with search and rescue operations continuing.

The Pacific nation’s government said search efforts “in open waters” were being scaled back “whilst efforts move toward a search along the south-east coast, where currents may have carried survivors”.

It said the sinking “appears to be the result of strong winds and marine warnings not being heeded, and possibly of negligence including overloading of the vessel”, adding that a full investigation would follow to establish the facts and prevent a repeat.

Vanuatu police, the country’s Maritime Safety Authority and the ferry’s operator, Tui Shipping Agency, did not immediately respond to requests for comment, the Reuters news agency reported.