Aghdam's family has been particularly critical of the Mountain View police, who they believe ignored warnings about their troubled relative and her hatred for YouTube.
Aghdam did not appear to have targeted particular victims when she opened fire with a legally purchased Smith & Wesson 9mm semiautomatic handgun, the San Bruno police chief said.
Hossein Naderi, a 23-year-old art student in Tehran, questioned why Aghdam chose to live in America, adding: "I wish I was there to use YouTube freely". He declined to say where she purchased the weapon.
YouTube chief executive Susan Wojcicki tweeted to say no words could describe "how terrible it was to have an active shooter" at the firm's headquarters. A slew of videos and social media posts show her disdain for the company's efforts to "demonetize" and filter her quirky vegan, workout, animal rights and dance videos.
On Wednesday, authorities searched two houses connected with Aghdam and collected evidence for the investigation. But she was not able to walk into the building itself, YouTube said in a statement on Wednesday.
How did the girl who grew up in Iran worshipping every insect become the woman who indiscriminately shot into a crowd of terrified YouTube employees who had been enjoying lunch on a sunny Silicon Valley patio?
Police say so far the only connection they can find between her and YouTube is her anger that the service had recently changed how she was compensated for posting videos. Aghdam's mother was crying, and her brother told one of the reporters that he did not know she owned a gun. One spent magazine was found at the scene, along with the gun and the second loaded magazine, he said.
Police said there was nothing during their 20-minute interaction with Nasim Aghdam that suggested plans for violence, and characterized their conversations with her father and brother as "calm" and mentioning no nefarious plans. She offered few specifics about what she believed had been suppressed, other than to complain that her workout videos had been flagged as adults-only content.
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ROTT: So not many people at - from YouTube are talking right now, but a lot of these tech companies have these sort of open-style campuses like YouTube's.
Today would have been her 39th birthday.
San Bruno police would not release the name of the gun range where Aghdam took target practice Tuesday, but Caldwell said the business reached out to authorities after seeing news reports of the shooting and recognizing the woman who had been there a short time earlier.
Police said officers had twice spoken with the family after finding her.
Officers in Mountain View - about 30 miles (48 kilometers) from YouTube's headquarters - found her sleeping in her vehicle in a parking lot around 2 a.m. Tuesday but let her go after she refused to answer their questions.
Zuckerberg San Francisco General Hospital said Thursday that a 36-year-old man remains hospitalized but has been upgraded to fair condition.
On Tuesday, Aghdam used one full gun magazine then loaded another one before shooting herself.
It's still unclear why she turned the gun on herself and whether she could have continued firing.