The Maryland National Guard has been activated in response to violence following the funeral of Freddie Gray Monday, the governor's office said.
Gov. Larry Hogan signed an executive order declaring a state of emergency and said he would hold a press conference Monday evening to address the situation.
"Today's looting and acts of violence in Baltimore will not be tolerated," Hogan said in an earlier statement. "I strongly condemn the actions of the offenders who are engaged in direct attacks against innocent civilians, businesses and law enforcement officers."
Gray was injured during an arrest on April 12 and died in the hospital a week later. His funeral was in Baltimore Monday. In the afternoon clashes broke out between school students and police, starting at Mondawmin Mall and spreading across the city.
Col. Charles Kohler, a National Guard spokesman, said before Hogan's statement that the National Guard had been monitoring events in Baltimore since Saturday through the news and had been notified to be prepared but had not received any specific requests for help.
A formal request for help would have to be made by city officials to the Maryland Emergency Management Agency and the governor makes the final decision to call up the National Guard, Kohler said.
The National Guard, which trains with police, will be able to provide extra manpower and help move police around the city, Kohler said. Small numbers of guardsmen will respond at first with additional soldiers called up if necessary, he said.