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 / Updated  / Source: NBC News

A tactical alert was lifted in Baltimore late Friday night, but the curfew remained in effect on the first night since the city’s top prosecutor announced charges for six police officers in the death of Freddie Gray.

Police said they arrested 15 people Friday after the 10 p.m. curfew, which was put in place Tuesday, went into effect. Police said they arrested 38 people during protests earlier in the day.

Earlier Friday, there were celebrations and rallies in Baltimore after State’s Attorney Marilyn Mosby announced criminal charges for six police officers involved in the April 12 arrest of Gray, a 25-year-old black man who died a week later from a spinal injury he suffered while in police custody.

Mosby said Gray's death was ruled a homicide, and Gray's arrest was illegal. Four officers face charges of involuntary manslaughter and other charges, and two others face charges of assault. The driver of the police van that transported Gray faces a charge of second-degree depraved heart murder.

The 10 p.m. emergency curfew was put in place after violence broke out over the weekend and on Monday, when 15 buildings and more than 100 vehicles were set on fire. Thirty-seven people were arrested for curfew violations Thursday night, police said.

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