Cyclone Idai may have killed more than 1,000 people and left 400,000 homeless near the port city of Beira in the southeastern African nation of Mozambique. It may be the worst weather-related disaster ever to hit the southern hemisphere, with 1.7 million people in the path of the cyclone in Mozambique and 920,000 affected in neighboring Malawi, U.N. officials told the BBC on Tuesday.

“The scale of suffering and loss is still not clear, and we expect that the number of people affected as well as the number of people who have lost their lives may rise,” said Jamie LeSueur of the International Federation of Red Cross and Red Crescent Societies (IFRC) in a statement.

Idai made landfall on March