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Advocate staff photo by TRAVIS SPRADLING -- Cumberland County Community Church Police and Fire Chaplain Robert Ossler, center, of Millville, New Jersey, prays with Baton Rouge's Chrissy Bond, left, and St. Rose's Bryian Loper, right, as they pay their respects Tues., July 19, 2016 to Baton Rouge's fallen law enforcement officers, at a memorial set up in front of the B-Quik convenience store near Sunday's ambush site.

A friend of Gavin Long says the man who killed three Baton Rouge officers appeared obsessed with the Alton Sterling shooting footage during a visit in DeSoto, Texas, according to a report in the Dallas Morning News.

Sterling is the man whose shooting death by Baton Rouge police officers led to protests across the country.

Two days after Micah Johnson's rampage during a protest in Dallas that left five police officers dead, Long sat staring at a television screen and playing the Sterling video repeatedly, Felix Omoruyi told the newspaper.

"See how they do us?" Omoruyi remembers his childhood friend saying. "They go and kill him for no reason."

Experts told the newspaper that repeatedly viewing such violent images can spark rage, which be can be reinforced in social media. That, they said, appears to be the case for both Johnson and Long.

Long and Johnson did not know each other, Omoruyi said, though Long praised the Dallas attacker, saying "at least he did something."

See the full Dallas Morning News story here.