Maryland's governor vowed there would be no repeat of the looting, arson and vandalism that erupted Monday in some of the city's poorest neighborhoods and sent a shudder through all of Baltimore.

Hundreds of State Police troopers and law officers from outside Baltimore poured into the city to help keep the peace.

The streets were largely calm in the morning and into the afternoon. But a state of emergency remained in effect, with the city under a 10 p.m.-to-5 a.m. curfew. All public schools were closed. And the Baltimore Orioles canceled their Tuesday night game at Camden Yards.

The looting and rock- and bottle-throwing by mostly black rioters broke out just hours after the funeral of Freddie Gray, a 25-year-old black man who suffered a fatal spinal cord injury while in police custody. It was the worst such violence in the U.S. since the unrest that erupted last year over the death of Michael Brown, the unarmed black 18-year-old shot by a white police officer in Ferguson, Missouri.