The Baton Rouge gunman has been identified as Gavin Eugene Long, according to multiple news outlets Sunday afternoon.

Citing unnamed “sources,” CBS News reported that Mr. Long was a black man from Kansas City, Missouri, who committed the ambush on his 29th birthday. The network also identified him as an ex-Marine who apparently had social-media accounts pushing black separatism.

NBC News reported the same name some moments later, citing “several law enforcement officials.”

The Wall Street Journal reported, citing “a person briefed on the investigation,” that the suspect had ties to “an antigovernment group called the New Freedom Group.”

According to CBS News, Long used such online pseudonyms as “Cosmo Setepenra” and “ConvosWithCosmo.”



Mr. Long apparently traveled to Louisiana, as his publicly available addresses are all in the Kansas City area and in Tuscaloosa, the site of the University of Alabama, where he had been named to the Dean’s List in 2012.



Three officers were killed and three were more injured Sunday in what police are describing as an ambush attack. The gunman was slain by police, though authorities are searching for possible accomplices.

The attack took place just a quarter-mile from the site where Alton Sterling was killed by police less than two weeks ago. That videotaped killing has sparked continuous Black Lives Matter and similar demonstrations against police in Baton Rouge and nationwide.

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