One police officer died and two others were critically injured in a shooting in Fargo, North Dakota, that also killed the suspect on Friday, police said.
The shooting happened before 3pm on a busy street. Multiple witnesses said a man opened fire on police officers before other officers shot the suspect.
In a statement late Friday, police said a civilian also was seriously wounded. Police did not provide information about a possible motive or circumstances leading to the shooting.
The identities of the slain officers and the suspect were withheld pending notification of their families.
Sanford Medical Center Fargo spokesperson Paul Heinert said in an email that the hospital did receive patients stemming from the shooting incident in Fargo. He said updates on their conditions would come from the Fargo police.
Police said there was no known threat to the public. But after the shooting, officers converged on a residential area about two miles (3.2 kilometres) away and evacuated residents as they gathered evidence they said was related to the shooting.
Witnesses reported seeing and hearing gunshots in the area. Surveillance video provided by Fargo resident Allison Carlson captured the rapid sounds of gunfire.
North Dakota Attorney General Drew Wrigley said the state Bureau of Criminal Investigation was working with federal, state and local law enforcement in response to a shooting incident but provided no details of what happened.
Police and other agencies across the region posted their sympathies for Fargo police on Facebook.