NAIROBI, Kenya (AP) — Heavy rains pounding different parts of Kenya have led to the deaths of at least 13 people and displaced some 15,000, the United Nations said, as forecasters warned more rains can be expected until June.

The U.N Office for the Coordination of Humanitarian Affairs, citing the Kenya Red Cross Society, said Thursday that nearly 20,000 people have been affected. That includes the estimated 15,000 displaced by heavy rains and flash floods across the country since the start of the wet season in mid-March.

The East African country has seen thousands of people killed by flooding in previous rainy seasons, mostly in the lake regions and downstream of major rivers.

The Kenya Red Cross Society told The Associated Press that five major roads were cut off by the floods, including Garissa Road in northern Kenya, where a bus carrying 51 passengers was swept away on Tuesday. All passengers were rescued.