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Using the pseudonym “Cosmo Setepenra”, Long, 29, railed in a series of videos, photographs and online writings at perceived injustices against black people.

“You gotta fight back,” he urged viewers in a video recorded a week ago.

Describing the fatal shooting of five police officers in Dallas, Texas, earlier this month as “justice”, Long urged black men to make sacrifices for their race.

He distanced himself, however, from well-known groups campaigning for African American rights.

“I thought my own thoughts, I made my own decisions – I’m the one who’s gotta listen to the judgment,” he said in another clip.

The 29-year-old was shot dead by responding officers on Sunday after allegedly shooting three officers dead and wounding three others, one critically.

His history of rambling postings indicated that the attack was motivated at least in part by killings by police of black Americans in recent years and the resulting unrest. In one recent clip, he expressed disgust over the arrest of protesters demonstrating in Baton Rouge over the fatal shooting of Alton Sterling earlier this month.

But they also pointed to apparent paranoia and mental instability. Long complained last year to likeminded message board users that he was a long-term victim of “gang-stalking”, a supposedly intense form of government and corporate surveillance covering every aspect of a subject’s life.

Claiming to be a round-the-clock “TI” – targeted individual – Long urged others in his situation to wear body cameras to monitor such surveillance and to warn companies involved in harassment “that we are going to expose your involvement and rate your poor performances & games on the internet”.

At least one suspect is dead. Law enforcement officials initially said they believed that two others suspects were at large, but at a news conference Sunday afternoon officials said the deceased suspect was likely the only shooter.

A senior law enforcement official said that suspect wore black fatigues and was armed with a rifle.

By 3 p.m. (CT) Sunday, state police said there was “no active shooter” situation.

Sources say two Baton Rouge Police officers and one East Baton Rouge Sheriff’s Office deputy are dead following the shooting. Another officer was critically injured. Several others suffered unspecified injuries during the shooting.

A witness told WBRZ News 2, a man was dressed in black with his face covered shooting indiscriminately when he walked out between a convenience store and car wash across from Hammond Air Plaza. Shots were fired around 9 a.m. Sunday. The exact location of the business where the shooting took place has yet to be released.