Some 2,000 National Guard troops and 1,000 police officers have been deployed to enforce a 10 p.m. to 5 a.m. curfew. Riots Monday left at least 20 officers injured and several buildings destroyed.
People gathered in the city's streets in support of Freddie Gray, who died after sustaining a fatal spinal cord injury during or after his arrest. Later, protests took a violent turn at Camden Yards.
In a blog post, Simon added that while there is much to be "argued, debated, addressed ... this moment ... can still, in the end, "prove transformational, if not redemptive for our city."
The president said "there's no excuse for the kind of violence" that has erupted after peaceful protests following the death of a black man who suffered a serious spine injury while in police custody.
Just hours after Freddie Gray's funeral, hundreds of demonstrators took to the streets, burning police cars, looting stores and facing off with police. The mayor instituted a curfew.
Even with the arrests, police said Saturday's protest over Gray — a 25-year-old black man who died in police custody after receiving a fatal spinal cord injury — was "mostly peaceful."
Giving an update about how Gray was injured, police said they still have many gaps to fill, but the picture is becoming clearer. Police now know that Gray was never buckled into the police van.