Authorities say during the course of the protests on 94 and later, on Grand and Dale, 21 officers from multiple agencies suffered injuries. The injuries were primarily caused by fireworks, rocks, bricks, glass bottles and chunks of concrete that were directed at officers, some hitting them in the head. St. Paul Police said someone threw a Molotov cocktail at officers, as well.
On Sunday evening, St. Paul Police learned one of the officers injured last night had a large concrete block dropped on his head. That officer is now suffering from a spinal fracture.
http://www.kare11.com/news/102-arrested-21-officers-injured-in-94-shutdown/268434384