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Many experts on extremism and technology say this suspect’s activity fits with a still-emerging profile of mass shooter.

The alleged shooter had purchased five firearms: two rifles, some pistols and possibly a shotgun, according to authorities, in 2020 and 2021.

Some videos are “ominous and violent,” including one that shows a stick figure with an automatic rifle and a person lying in a pool of blood.

The shooter allegedly accessed the roof via an alley using a ladder that was attached to the building and was unsecured.