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Two policemen have been shot amid protests in the US over a decision not to charge any officers over the killing of Breonna Taylor.
Ms Taylor, 26, a black hospital worker, was shot six times as three officers raided her home on 13 March.
A grand jury in the city of Louisville returned only one minor charge against one of the officers, for shots which hit a neighbouring apartment.
The attorney general said the two other officers' actions had been justified.
One had been hit by a shot fired by Ms Taylor's boyfriend, who later told police he thought it was an ex-boyfriend of Ms Taylor who had broken into the apartment.
Image copyright Facebook Image caption Breonna Taylor was an emergency medical technicianA judge had granted a warrant to search Ms Taylor's home because investigators suspected her ex-boyfriend, a convicted drug dealer, was using the address to receive packages. Ms Taylor had no criminal record.
Cases of killings of unarmed black people by police have fuelled anger across the US and beyond, spurred especially by the death of George Floyd in police custody in Minneapolis in May.
What is happening in Louisville?
The two police shot on Wednesday do not have life-threatening injuries and a suspect has been arrested.
A state of emergency has been declared and the National Guard has been deployed. A three-day curfew from 21:00 to 06:30 (01:00-10:30 GMT) has been introduced, though crowds were still gathered after it came into effect.
Dozens of protesters were arrested in Louisville overnight, with officers saying the total number of arrests may reach 100.
At a news conference on Wednesday night, Louisville Interim Police Chief Robert Schroeder refused to comment on whether suspected gunman had been participating in protests.
"I am very concerned about the safety of our officers," said Chief Schroeder. He said one injured officer has undergone surgery and they are both expected to recover. The officers have not been named.
According to the Associated Press, the attack happened as protesters were moving through an alleyway to avoid a police roadblock as officers lobbed pepper balls at them. As shots rang out, the crowd scattered to take cover as officers in riot gear and rifles swarmed the area.
Protests over the grand jury's decision also took place in New York, Washington, Atlanta, and Chicago.
Tears and shock
By Aleem Maqbool, BBC News, Louisville
At the moment protesters heard there would be no charges against officers directly relating to the killing, there were anguished cries, tears and shock at the tribute spot in Louisville dedicated to her memory.
As the evening went on, some told us they felt the officers would get charged, given the $12m (£9.3m; €10.3m) settlement the city of Louisville had agreed with Breonna Taylor's family, which they saw as an admission that there had been wrongdoing.
Image copyright Getty ImagesOthers told us that in spite of the outcry after George Floyd's death, they felt there had been no systemic change and that police officers would continue to be protected in a way they saw as unfair.
The numbers on the streets thinned as the curfew approached, but that was when the two officers were shot and injured. One protester told me that he would keep taking to the streets until he saw police face the same accountability as the suspect who was arrested for shooting the officers is likely to.
What charges have been brought over the case?
One of the officers who raided Ms Taylor's apartment, Brett Hankison, was charged with three counts of "wanton endangerment in the first degree". Mr Hankinson was fired from the force in June.
Under Kentucky law, wanton endangerment applies to an act of "extreme indifference to the value of human life". It is the lowest-level felony and carries a maximum sentence of five years in prison.
Ms Taylor's relatives and activists had been calling for the three officers, who are all white, to be charged with murder or manslaughter.
This was rejected by a grand jury - a panel drawn from members of the public to determine whether there is enough evidence to pursue a prosecution - that reviewed the evidence.
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Following the decision, Kentucky Attorney General Mr Cameron - the state's top prosecutor - said there was "nothing I can offer [Ms Taylor's family] today to take away the grief and heartache as a result of losing a child, a niece, a sister and a friend," calling it a "gut-wrenching emotional case".
Mr Cameron said a ballistics report had found that six bullets had struck Ms Taylor, but only one had been fatal. That analysis concluded that Detective Myles Cosgrove had fired the shot that killed Ms Taylor.
The attorney general said it was not clear if Mr Hankison's shots had also hit Ms Taylor, but they had hit a neighbouring apartment.
He said Mr Cosgrove and the third officer, Jonathan Mattingly, had been "justified to protect themselves and the justification bars us from pursuing criminal charges".
The FBI was still investigating potential violations of federal law in the case, Mr Cameron added.
What has been the reaction?
Ben Crump, a high-profile lawyer for the Taylor family, said the decision was "outrageous and offensive".
When asked about the charges at a White House news conference, US President Donald Trump said he "thought it was really brilliant".
He praised Kentucky's attorney general, who addressed the Republican party convention last month, for "doing a fantastic job".
Image copyright Getty Images Image caption Large scale protests have been held in other cities, including New YorkMr Trump's Democrat challenger for November's election, Joe Biden, said the decision "does not answer" the call for justice, while telling protesters to act peacefully.
Kentucky Governor Andy Beshear, a Democrat, urged prosecutors to release the evidence that was presented to the grand jury.
"I think having more of the facts out there so people can see, people can truly process it, is where we need to be," he said.
What were the circumstances of Ms Taylor's killing?
Plainclothes police, executing a search warrant, forced their way into the apartment where Breonna Taylor was in bed with her boyfriend, Kenneth Walker, shortly after midnight.
Mr Walker fired a shot from his licensed gun, later telling police he thought that Ms Taylor's ex-boyfriend, Jamarcus Glover, had broken in, according to the New York Times.
Officials say Mr Walker's bullet struck Mr Mattingly in the leg. The three officers returned fire, discharging 32 rounds, according to a ballistics report from the FBI.
Ms Taylor was shot amid the commotion and died on the hallway floor.
No drugs were found at the property, though Jefferson County Prosecutor Thomas Wine said the search was cancelled after the shooting.
Image copyright LMPD Image caption From left: Brett Hankison, Jonathan Mattingly and Myles CosgroveA subsequent police report contained errors, including listing Ms Taylor's injuries as "none" and saying no force was used to enter, when a battering ram had been used.
Mr Hankison was fired from the police after investigators found he had "wantonly and blindly fired 10 rounds" during the raid, according to his termination letter.
Mr Mattingly and Mr Cosgrove were reassigned to administrative duties.
