Maryland Governor Larry Hogan declared a state of emergency and activated the National Guard to address the violence in Baltimore, his office said on Monday.
The governor's office said the actions came at the request of the city of Baltimore. It added that Hogan would hold a news conference at 8:30 p.m. to discuss the violence following the funeral of a 25-year-old black man who died after he was injured in police custody.
Earlier, protesters hurled bricks, looted businesses and set fires in Baltimore in violence that injured at least seven police officers following the funeral of a 25-year-old black man who died after he was injured in police custody.
The riots broke out just a few blocks from the funeral of Freddie Gray and then spread through parts of Baltimore in the most violent US demonstrations since looting in Ferguson, Missouri, last year.