Police in the US city of Baltimore say they won't publish a report into the death of a black man injured in custody, as planned, on Friday.
Instead, the document will be given straight to prosecutors.
It is feared the decision could prompt fresh violence in Baltimore - with hundreds of people arrested following clashes with police earlier this week after Freddie Gray's funeral.
Police last night fired smoke bombs and pepper pellets at hundreds of protesters in Baltimore who defied a night-time curfew.
The restrictions, which went into effect at 10pm on Tuesday (3am BST), have been imposed for a week in response to riots that erupted after the funeral of Freddie Gray who died of injuries suffered while in police custody.
"The curfew violators are refusing to follow lawful orders by officers to leave the area," police said on Twitter.
Demonstrators threw bottles at police, and picked up the smoke grenades and hurled them back at officers.
Thousands of National Guardsmen have been deployed in the city to try to prevent a repeat of Monday's violence that saw buildings burned and shops looted.
Baltimore's mayor has come under fire for the city's response to the riots.
Maryland Governor Larry Hogan said Stephanie Rawlings-Blake initially held off on requesting National Guard troops as the violence escalated.
"The mayor of Baltimore had the city of Baltimore police on the ground. Quite frankly, they were overwhelmed," Mr Hogan said. "All the rest of the (boots) on the ground came from us."
The governor said he called Ms Rawlings-Blake repeatedly on Monday but she refused to request troops until three hours after violence erupted.
"It's a very delicate balancing act, when we have to make sure that we're managing but not increasing and escalating the problem," she said.
Baltimore Police Commissioner Anthony Batts appeared to come to the mayor's defence at a news conference on Tuesday.
"My mayor takes a lot of shots," he said. "She's courageous enough to stand here and take it."
Mr Gray, 25, died on 19 April from a severe spinal injury he suffered while in police custody.
His death fuelled a growing national debate on the use of US police tactics, particularly in regard to officers’ interactions with young black men.
