The US Department of Justice has been asked to investigate how the shooting of an unarmed black man has been handled by police and prosecutors.
Ahmaud Arbery, 25, was allegedly murdered by two white men – father and son Gregory McMichael, 64, and 34-year-old Travis McMichael.
Mr Arbery was shot dead on 23 February as he ran through a neighbourhood in Brunswick, Georgia – but no charges were brought for more than two months.
Then last week a 36-second video emerged appearing to show the shooting, and shortly after the leak the McMichaels were arrested and charged with murder and aggravated assault.
Georgia’s attorney general Chris Carr has asked the US Department of Justice to intervene in the case, saying questions must be answered about how it was handled.
It comes after musicians including Jay-Z and Alicia Keys signed an open letter on Sunday calling for quick action.
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Mr Carr said in a statement: “We are committed to a complete and transparent review of how the Ahmaud Arbery case was handled from the outset.
“The family, the community and the state of Georgia deserve answers, and we will work with others in law enforcement at the state and federal level to find those answers.”
Gregory McMichael said he thought Mr Arbery looked like a suspect in a series of recent break-ins, according to a police report.
Mr Arbery’s mother, Wanda Cooper Jones, has said she thinks her son, a former high school football player, was jogging in the neighbourhood before he was killed.
He has been described by those who knew him as a “very good young man”.
Hundreds of people joined a protest on Friday in Brunswick, near the site where Mr Arbery was shot.
The open letter signed by celebrities was sent from the social justice arm of rapper Jay-Zs Roc Nation entertainment company and published in the Atlanta Journal-Constitution.
It said: “By now, we’ve all seen the crime’s disturbing video, so the facts here are not in doubt: He was unarmed and innocent and the victim of a hate crime.”
Singer Alicia Keys said: “If anybody saw that horrifying video of his killing, it is heartbreaking, unbelievably unacceptable and inhumane.
“No human being should be murdered and not receive justice. I have black sons and they should be able to go on a jog or anywhere they want without the risk of being killed.”
It called for district attorney Tom Durden to be taken off the case due to a possible conflict of interest as Gregory McMichael is a former police officer.