NAIROBI, Kenya (AP) — A dam collapsed in western Kenya early Monday, killing at least 45 people and leaving dozens missing after a wall of water swept through houses and cut off a major road, the Interior Ministry said.

The Old Kijabe Dam, located in the Mai Mahiu area of the Great Rift Valley region that is prone to flash floods, collapsed and water spilled downstream, carrying with it mud, rocks and uprooted trees, police official Stephen Kirui told The Associated Press.

Vehicles were entangled in the debris on one of Kenya’s busiest highways and paramedics treated the injured as waters submerged large areas.

The Kenya Red Cross said 109 people were hospitalized while 49 others were reported missing.

William Lokai told Citizen TV that he was woken up by a loud bang and shortly after, water filled his house. He escaped through the roof together with his brother and children.