Updated at 10:55 p.m. ET:
As the curfew declared by Baltimore's mayor goes into effect, a number of protesters — hundreds, according to The Associated Press — are refusing to leave the streets, and are facing off against gathered police officers.
Protesters threw objects at the police when they first advanced on the crowd, and police responded with smoke grenades and flash grenades at about 10:25 p.m.
To the southeast, National Guard troops could be seen stationed in the city's Inner Harbor entertainment district.