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Mourners pray at a memorial to for the victims of the shooting at a mall in Allen, Texas
Graphic videos from the scene of a mass shooting in Texas spread rapidly and were viewed millions of times on Twitter before the social media site began taking the footage down more than 24 hours after the attack.
One video showed dead bodies of the victims, including what appeared to be children. Another showed the perpetrator lying dead on the ground.
Both clips were visible at or near the top of search results in the hours after news broke of the attack north of Dallas.
Many users expressed shock at how easily the footage spread, mostly without content warnings.