The woman who shot three people at YouTube headquarters in Northern California's San Bruno area before killing herself has been identified as 38-year-old Nasim Aghdam.
"We know very, very little right now, and we probably won't know more until tomorrow morning," CNN reported, citing San Bruno Police Chief Ed Barberini as saying.
Four civilians got injured after a female gunman opened fire in an outdoor courtyard and then died after shooting herself.
Three victims, injured in the incident have been admitted to the San Francisco General Hospital and one is reportedly in a critical condition.
According to media reports, the United States law enforcement agencies are investigating the shooting incident as a 'domestic dispute'.
US President Donald Trump on Wednesday offered his "thoughts and prayers".
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Trump took to his Twitter account to inform that rescue teams and law enforcement officers have reached the site of the shooting.
"Was just briefed on the shooting at YouTube's HQ in San Bruno, California. Our thoughts and prayers are with everybody involved. Thank you to our phenomenal Law Enforcement Officers and First Responders that are currently on the scene", Trump tweeted.
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