Cyclone Mora struck the island of Saint Martin and Teknaf in the coastal Bangladeshi district of Cox’s Bazar early on Tuesday, where officials said some 200,000 people were evacuated to shelters.

Cox’s Bazar district Chief, Mohammad Ali Hussin said at least 15,000 houses in the district had been destroyed and he had unconfirmed reports of three people killed and dozens injured, including several Rohingya refugees.

The border area is also home to refugee camps for hundreds of thousands of Rohingya Muslims from Myanmar who have fled from violence in their homeland in northwest Myanmar. A U.N. official working with Rohingya refugees in Bangladesh said the damage in the camps could not be assessed while the storm was raging.

The cyclone formed after monsoon rains triggered floods and landslides in Sri Lanka, off India’s southern tip, killing at least 180 people in recent days, authorities said.

It was expected to weaken in Bangladesh by late morning as it moved inland towards India where authorities have warned of heavy rain in northeastern states.