Deputies in Mecosta County believe a medical issue was the likely cause of a crash involving a vehicle and semi-truck.

An investigation found that a 57-year old man from Stanwood ran into the back of a semi on southbound US-131 near Jefferson.

Stanwood man and his passenger, a 55-year old woman from Missouri, were injured. 

They were taken a local hospital  for treatment. The semi driver was not injured.