Sri Lanka’s navy has rescued 104 Rohingya adrift off the Indian Ocean island nation’s northern coast, an official said.

Tens of thousands of mainly Muslim Rohingya suffer hardships in cramped refugee camps in Bangladesh after they escaped violence by the Myanmar military.

The United Nations said the military operation was conducted with a “genocidal intent” and it was investigating Myanmar officials.

Many Rohingya in Bangladesh and Myanmar risk their lives every year by attempting to reach Southeast Asian countries such as Malaysia and Indonesia on rickety vessels.

Their numbers have surged following deteriorating conditions in the camps and last year’s military coup in Myanmar.

The boat was first detected by the Sri Lanka navy when it was 3.5 nautical miles (6.5km) from the shore.

A search and rescue operation was launched to eventually tow the vessel to the island nation’s northern harbour on Sunday night, navy spokesman Captain Gayan Wickramasuriya said.

A navy statement said 104 Myanmar nationals were found on board the small trawler suspected to have originated from Myanmar and was heading to Indonesia when it ran into engine trouble in rough seas.