It's hard to know exactly what's going on.
From the storyline the tweets tell, after Freddy Gray's funeral this morning things heated up considerably. Various police transports have been set on fire, and the police inexplicably seem to have had a major confrontation with a bunch of high school students who were sent home early because of the protests but were unable to get home because the major public transport hubs in Baltimore have been shut down.
Less lethals have been fired by the Baltimore police; various objects have been sent the other way. A payday loan store and perhaps a CVS may have been trashed. And one person decided to exercise his First Amendment rights by mooning the police line.
4:59 PM PT: Incredible pictures here:
5:04 PM PT: Ruh Roh