Three police officers have been shot dead in Baton Rouge, Louisiana. Here is what we know so far.
On Sunday morning, a gunman killed three police officers and injured three others in Baton Rouge, Louisiana's capital.
Witnesses described the gunman as having his face covered and wearing black when he started "shooting indiscriminately".
Officers were allegedly lured to the scene by reports of gunfire around 9am.
After an exchange of bullets, Long was shot to death by police who had converged on him.
Who was the gunman?
The gunman has been named as 29-year-old Gavin Long, and was a former soldier with the Marine Corps, according to a US government official.
Long, who celebrated his birthday on the day of the attack, rose to the rank of sergeant during his years of service from August 2005 to August 2010.
He was deployed to Iraq from June 2008 to January 2009, and left the Marines with an honourable discharg and a number of service medals - including one for good conduct.
Long, from Kansas, Missouri, divorced his wife in 2011, according to court papers.
Who were the victims?
Montrell Jackson, 32, was married to Trenisha and had a four-month-old son.
A 10-year veteran, Mr Jackson described on Facebook just days before his death the struggle of being a black man and a police officer.
Matthew Gerald, 41, was a father-of-two who had only been part of the police force for one year, having served in the Marines and US army.
Mr Gerald completely three tours of Iraq.
Brad Garafola, 45, had four children aged between seven and 21.
Mr Garafola had 24 years of experience working with the East Baton Rouge Parish Sheriff's Office
What has been the reaction?
Barack Obama and Hillary Clinton were both quick to condemn the attack.
President Obama called on Americans to pull together, "regardless of race or political party", while Mrs Clinton said the attack was a "devastating assault on all of us".
During an emotional press conference, one Baton Rouge officer said: "Until we come together as a nation and a people, to heal as a people - if we don't do that and this madness continues - we will surely perish as a people".