Few points:
-Gray had a very long criminal record, known as a drug dealer. No saint. On going investigation on what happened and gathering evidence like they do in every case like this. It takes time. Rioting and looting every time there's a black person killed by the police isn't the answer. The few criminals are just using those circumstances to act like savages and inciting others.
-Police are not trained to shoot to kill, they are trained to stop the threat and if shooting a criminal is necessary they are trained to shoot at the largest body mass so not to miss the target, shoot until the deadly threat has stopped.
-There is a legal system that exist for everyone, a legal peaceful protest is acceptable as long as they obey the laws. Throwing rocks and bricks at officers that had nothing to do with Gray's death is attempting murder. Those violent criminals were lucky not to get shot. The National Guards may not be as nice if they face the same situation. Lets hope cooler heads prevail and all is under control soon.