Violent pictures from an electoral reform protest in Nairobi were shared widely on Tuesday morning. Here's what happened. WARNING: This post contains violent images and videos.

Images of violent clashes between riot police and protesters in Nairobi, Kenya, were shared widely on Tuesday, with one image — taken by AP photographer Ben Curtis — of an officer apparently about to stamp on the head of a man with his head lying against the curb drawing particular attention.

Ben Curtis / AP

The photos were taken at an electoral reform demonstration on Monday, where one protester was pictured fleeing with blood pouring out of a gash on his forehead and running down his face as police fired tear gas and wielded truncheons.

The photos were taken at an electoral reform demonstration on Monday, where one protester was pictured fleeing with blood pouring out of a gash on his forehead and running down his face as police fired tear gas and wielded truncheons.