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After YouTube shooting, police science and workplace security experts answer questions about campus access and vetting police tips

YouTube's headquarters is seen during an active shooter situation in San Bruno, California on April 03, 2018.
YouTube's headquarters is seen during an active shooter situation in San Bruno, California on April 03, 2018.

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After yesterday’s shooting on YouTube’s San Bruno campus that left three people injured and the shooter dead, we’re learning more about the woman who is suspected of carrying out the attack and why she might have done it.

San Bruno Police Chief Ed Barberini says the YouTube shooter was angry about the policies and practices of the company and had visited a gun range before she drove to the company's headquarters near San Francisco. He says 39-year-old Nasim Najafi Aghdam got into the building through a parking garage.

Barberini said Wednesday that investigators are in the process of executing search warrants at two properties. He also said that the gun used in the shooting was a legally purchased 9mm handgun, and that Aghdam had gone to a gun range before carrying out the shooting.

We’re also learning that at least one family member had reportedly contacted police with concerns that Aghdam “might do something,” though he apparently did not specify what that “something” might be.

We’ll get the latest from a reporter who has been covering the story, talk with a workplace security expert about how she was able to walk onto YouTube’s campus to carry out the shooting, and hear from an expert in police tactics on how law enforcement vets and triages tips from people who believe a family member may be a danger to themselves or others.


Trisha Thadani, business reporter for the San Francisco Chronicle; she has been covering the story since it broke Tuesday afternoon

Maria Haberfeld, professor of police science at John Jay College of Criminal Justice; she specializes in police training

Steve Albrecht, threat assessment expert and consultant who has put together threat assessment teams and security trainings for workplaces and schools for over 25 years; he was formerly a police officer in San Diego