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UPDATED: This timeline shows exactly how the YouTube shooting unfolded

youtube shooting reuters video
Video footage shows people leaving YouTube's headquarters with their hands up. Reuters
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On Tuesday afternoon Nasim Aghdam opened fire at YouTube's headquarters in San Bruno, California.

She shot three people — though none fatally — and was found dead of a self-inflicted gunshot wound to the chest.

Here, moment by moment, is how the event unfolded.

This post will be updated as more information emerges.

April 2, 2018: Nasim Aghdam is reported missing from her hometown of San Diego, California. Her father is worried she may be heading for YouTube HQ, and tells police.

Nasim Aghdam website
Nasim Aghdam in a screenshot from her website. NasimeSabz.com

April 3, 1:40 am.: Police in Mountain View, California, find Aghdam asleep in her car in a parking lot. They speak for 20 minutes.

Mountain View California parking lot YouTube Shooting
A parking lot around the location officers said they found Aghdam asleep in her car. Google Street View

2:00 am.: Officers leave Aghdam. They said she was "calm and cooperative" and told them she had no plans to hurt anybody. They let her family know where she is.

3:00 am.: Aghdam's father returns a call from Mountain View police. He explained her apparent anger at YouTube, but "did not seem concerned" that anything bad may happen.

Later that morning: Aghdam drives from Mountain View to San Bruno. The precise time is unclear.

Mountain View to San Bruno map
Google Maps

San Bruno police say Aghdam visited a "local" gun range before the attack, but did not say which one. Pictured below are search results for shooting ranges in the area.

San Bruno gun ranges
Google Maps.

After finishing at the range, Aghdam parked near YouTube HQ and entered the campus on foot via a parking garage.

YouTube HQ Map San Bruno shooting
Police run towards YouTube's headquarters in San Bruno to confront the shooter. Skye Gould/Business Insider

12:46 p.m.: San Bruno police receive the first 911 calls from people at YouTube HQ reporting gunshots.

san bruno youtube shooting
Police outside YouTube's offices during the shooting. Associated Press/Jeff Chiu

12:48 p.m.: Police arrive and start searching the building.

San Bruno YouTube shooting police
Police run towards YouTube's headquarters in San Bruno to confront the shooter. AP

12:57 p.m.: Word starts to get out. YouTube employee Vadim Lavrusik tweets that he is hiding from the shooter behind a makeshift barricade.

1:01 p.m.: San Bruno police post a tweet warning of "activity" around YouTube HQ, but do not yet describe it as a shooting.

1:05 p.m.: Business Insider first reports the shooting.

1:10 p.m.: YouTube product manager Todd Sherman tweets that other employees told him the shooter had already shot herself.

Sherman also describes seeing bloodstains on the floor and stairs of the building as he fled.

1:13 p.m.: 16 minutes after his first tweet, Lavrusik says he is outside and safe.

1:28 p.m.: San Bruno police tweet again, this time acknowledging an "active shooter" situation.

1:30 p.m.: Google acknowledges the shooting.

Around 2.18 p.m.: Lavrusik's account is hacked and used to spread misinformation about the shooting.

Messages from Lavrusik's account, which had previously posted true information about the shooting, wrongly named Daniel "Keemstar" Keem as a potential victim. In reality, he was not involved at all.

Business Insider's Rob Price has written in more detail on hoaxes published around this shooting.

2:25 p.m.: Local TV news reports that the shooter is dead.

2:37 p.m.: Injuries are confirmed. Police initially say four people have gunshot wounds, this is eventually revised down to three.

2.49 p.m.: President Donald Trump sends his "thoughts and prayers" to those affected.

3:14 p.m.: Surgeons at Zuckerberg San Francisco General Hospital say the three victims are being treated, and range from "critical" to "fair".

YouTube shooting Zuckerberg hospital
Trauma surgeon Andre Campbell updates the media outside Zuckerberg San Francisco General Hospital. Reuters

4:34 p.m.: Google CEO Sundar Pichai sent a letter to all Google employees describing the "unimaginable tragedy."

6:19 p.m.: YouTube CEO Susan Wojcicki says the company "will come together and heal as a family."

6:58 p.m.: Media begin to name Nasim Aghdam as the shooter, citing law enforcement sources.

10:26 p.m.: San Bruno police name Nasim Aghdam as the shooter and publish a photograph.

April 4, 2018, 4:07 p.m.: YouTube releases a statement clarifying that Nasim Aghdam accessed the premises through a parking garage, and reached an outdoor courtyard where the violence unfolded. She never made it inside the building, the statement said.

YouTube says it will increase security at all of its offices worldwide as a result of the incident.

youtube
Leanna Garfield/Business Insider

"We are also revisiting this incident in detail and will be increasing the security we have at all of our offices worldwide to make them more secure not only for the near term, but long term," the statement read in part.

"We want to express our deepest gratitude to the first responders, including the police, fire department, and medical teams. And a huge thank you also to the wider global community for their outpouring of support, well wishes, and words of togetherness."

YouTube CEO Susan Wojcicki speaks on stage during the annual Google I/O developers conference in San Jose, California, U.S., May 17, 2017.
Stephen Lam/Reuters

YouTube's statement continued: "Your support reminds us that even in the toughest of times, the YouTube community comes together and supports one another."

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Bryan was a former senior editor on the West Coast news team who joined Insider in January 2015. He built the West Coast news division from a staff of one to a team of 12, expanding its footprint from San Francisco to Los Angeles and Sydney, Australia, from 2015 to 2018. In 2019, Bryan took over leadership duties on Insider's transportation desk, successfully growing the team from four full-time journalists to a group of eight reporters, two correspondents, and an associate editor in less than a year. Under his leadership, the transportation team broke stories on TeslaNASA, and United Airlines. It produced extensive coverage of the SpaceX Demo-2 launchprofiled Ford CEO Jim Hackett on the future of the legacy automaker, and launched a quarterly series spotlighting the next phases in the world of mobility. Bryan was also part of the inaugural team that launched Insider's revamped IGNITION conferencehosting the titans of the transportation, tech, and mobility industries in San Francisco. In 2020, Bryan rejoined Insider's news desk to oversee the expansion the West Coast bureau, which includes reporters in Hawaii and an office in Singapore.  Bryan is an LA native who began his career in talk radio and also anchored weekend news coverage for an NPR affiliate in San Diego.
Kieran was an Executive Editor at Business Insider and its first Deputy Bureau Chief in the UK.He spearheaded BI’s work on the war in Ukraine and helped lead its breaking-news effort.He joined Business Insider in 2017, when it had no general-news desk in London, and built that team to more than a dozen people.He helped oversee coverage spanning politics, defense, business, science, health, entertainment, royalty, and lifestyle.In his time at BI, the UK news team won a Drum Award for its Ukraine reporting. Its work was twice shortlisted twice in the British Journalism Awards and highly commended once.He occasionally broke ranks to blog about Latin.Before Business Insider he worked for Dow Jones, MailOnline, The Sun, and The Independent.Kieran graduated from the University of Cambridge with a degree in English. He speaks some Russian and less French.He is on X with the handle @kj_corcoran.Notable work from his teams includes:The Unyielding City: How Ukraine lost Bakhmut and Russia won a hollow victoryIran will pay for gender-transition surgery, but it comes at a cost — your dignityA bright, talented Ukrainian journalist signed up to help Fox News cover the war. Two months later she was dead.Salt Bae's former employees describe tip theft, discrimination, and polyester uniforms‘I feel conned into keeping this baby’How an entire nation embraced toxic bleach as a COVID-19 miracle cureA Saudi princess, silencedInside London's derelict 'Billionaires Row' — a mile-long street of mystery, murder, and tax avoidance