Police have used tear gas to disperse protesters after officers were injured and a major road was shut down during a demonstration over the latest fatal shooting of a black man by US police.
The protests broke out on Tuesday in Charlotte, North Carolina, after 43-year-old Keith Lamont Scott was shot at an apartment complex in the north east of the city. Police said he was armed and posed a threat.
The demonstration continued into Wednesday morning when TV footage showed dozens of protesters on Interstate 85 facing a line of law enforcement officers. At one point a fire flared up.
The North Carolina Department of Transportation website showed a portion of I-85 was closed in both directions due to police activity.
Earlier in the night, a larger group of demonstrators gathered near the scene of the shooting.
Agitators destroying marked police units. CEU continues to work to restore order and protect our community. pic.twitter.com/ZSYSt374w0— CMPD News (@CMPD) September 21, 2016
Charlotte-Mecklenburg Police Department tweeted that demonstrators were destroying marked police vehicles and about 12 officers had been injured, including one who was hit in the face with a rock.
Approximately 12 officers injured. One officer hit in face with a rock— CMPD News (@CMPD) September 21, 2016
Photos and TV video showed police firing tear gas to break up the crowd. Some officers were in riot gear.
The unrest in Charlotte came hours after another demonstration in Tulsa, Oklahoma, over the shooting of an unarmed black man by police.
Charlotte police officers went to the apartment complex looking for a suspect with an outstanding warrant when they saw Mr Scott - who was not the suspect they were looking for - inside a car, department spokesman Keith Trietley said.
Officers saw Mr Scott get out of the car with a gun and then get back in, Mr Trietley said. When officers approached, the man exited the car with the gun again, at which point, officers deemed the man a threat and at least one fired a weapon.
Mr Scott was taken to Carolinas Medical Centre and pronounced dead.
Officer Brentley Vinson, who shot Mr Scott, has been placed on administrative leave, which is standard procedure in such cases. He has been with the department for two years.
Detectives recovered a gun at the scene and were interviewing witnesses, Mr Trietley said.
Police blocked access to the area, about a mile from the campus of the University of North Carolina at Charlotte, as protesters gathered after the shooting.
Video from WCCB-TV in Charlotte showed police in riot gear stretched across a two-lane road confronting protesters at the apartment complex later in the night. Some of the officers flanked the main line on one side of the road.
Some protesters were heard shouting "Black lives matter" and "Hands up, don't shoot". One person held up a sign saying "Stop Killing Us".
Other footage showed protesters lingering around a police vehicle after shattering its windows.
One television news crew retreated from the scene after demonstrators began rocking their remote van, which was parked near the apartment complex.
Charlotte mayor Jennifer Roberts appealed for calm and tweeted that "the community deserves answers".
In Tulsa, hundreds of people rallied outside police headquarters calling for the firing of police officer Betty Shelby, who shot 40-year-old Terence Crutcher on Friday during a confrontation in the middle of a road that was captured on police dashcam and helicopter video.
Ms Shelby's lawyer has said Mr Crutcher was not following officers' commands and Ms Shelby was concerned because he kept reaching for his pocket as if he was carrying a weapon. A lawyer representing Mr Crutcher's family said he committed no crime and gave officers no reason to shoot him.
Local and federal investigations into that shooting are continuing.