BALTIMORE (AP) - Many Baltimore residents say their hearts are aching as peaceful protests over the death of a man injured while in police custody have been replaced by rioting by what Mayor Stephanie Rawlings-Blake calls "thugs."

Resident Kevin Johnson says his "heart is broken" because a community center for the elderly that was still under construction burned to the ground.

The violence started Monday just as high school let out. Young people began looting a local mall and a liquor store. 

Baltimore Mayor says "thugs" are trying to "tear down what so many have fought for."

Mayor Stephanie Rawlings-Blake has imposed a curfew, to begin tonight, and Maryland's governor has declared a state of emergency, calling in the National Guard to restore order to the city.

Hours after the funeral for a black man who was injured while in police custody, rioters torched buildings and police cars and threw bricks at officers, injuring 15 of them.