Protests are erupting after the grand jury’s decision not to charge the cops who fatally shot Breonna Taylor, and while most were peaceful … there were also violent and disturbing incidents in several cities.

A pickup truck accelerated and plowed through a group of protesters marching in Buffalo Wednesday night, injuring at least one person who was on a bicycle. Officials reported that person was transported to a hospital with non-life-threatening injuries, and the truck driver is reportedly in custody.

Elsewhere in Seattle, 13 people were arrested as protests turned violent … and one cop was brutally struck with a baseball bat in the back of his head.

The officer was on a bike when he lost balance and fell, and after someone threw a cone at him … he shot pepper spray to keep the crowd at bay. That’s when someone ambushed him from behind and cracked his helmet with a full swing of a metal bat.

Seattle police say the cop was one of multiple officers injured in the chaos, and they’re still searching for the bat-wielding suspect.

Finally, in Louisville, 2 officers were shot and wounded amid the Breonna protests. The Interim Police Chief says a suspect’s in custody and both officers are expected to recover … though one had to undergo surgery.

As we reported … only one of the cops involved in the raid that led to Breonna Taylor’s killing — fired officer Brett Hankison — is being charged for the incident. He’s facing 3 counts of wanton endangerment for shooting into the apartment next to Taylor’s. No one is charged for shooting and killing Breonna.