Police are investigating two fatal motorcycle crashes that occurred about an hour apart in Kansas City, Kan.

The first crash happened around 11 p.m. Saturday when a pickup truck rear-ended a motorcycle. Police said in a news release that responding officers found the man who was driving the motorcycle dead from his injuries. The driver of the truck wasn’t injured.

The second crash happened just after midnight Sunday, and the motorcycle was the only vehicle involved. Police said the male driver was dead, and a female passenger sustained non-life-threatening injuries.

The names of the victims weren’t immediately released.