NAIROBI, Kenya (AP) — The torrential rains and deadly floods that have hit Kenya since March have been some of the most catastrophic in the country in recent years.

At least 169 people have died due to the heavy rains, with more than 91 missing, according to the latest government figures.

In the most tragic single event, at least 48 people were killed on Monday after water blew through a blocked river tunnel under a railway bridge in southwestern Kenya, causing a flash flood. The rain has displaced more than 100,000 people and damaged roads and other infrastructure.

The devastating rains are a result of a mix of factors, including the country’s seasonal weather patterns, human-caused climate change as well as natural weather phenomena.

Here’s how they combined to create the deadly deluge.