A woman who shot three people before turning the gun on herself Tuesday at the California headquarters of tech company YouTube visited a local gun range before the attack, according to police.

Chaos erupted when a shooter, identified by police as 39-year-old San Diego resident Nasim Najafi Aghdam, opened fire in a courtyard on YouTube’s campus.

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An Amazon Web Services employee is shown working inside one of the company's data centers. (Noah Berger/Courtesy of Amazon Web Services)

Credit: Courtesy Amazon Web Services / Noah Berger