A woman opened fire on campus at YouTube's headquarters in San Bruno, California. In a press conference, police confirmed that the shooter is dead from a self-inflicted gunshot wound. At least three people were wounded in the rampage and taken to Zuckerberg San Francisco General Hospital. A hospital spokesman told CNN affiliate KGO about the condition of three patients: a 36-year-old man in critical condition, a 32-year-old woman in serious condition and a 27-year-old woman in fair condition.

On Tuesday afternoon,YouTube  employees tweeted that they heard gunshots. Vadim Lavrusik, a product manager for YouTube, wrote, "Heard shots and saw people running while at my desk. Now barricaded inside a room with coworkers." Twenty minutes later, he tweeted that he had been safely evacuated.

Another product manager, Todd Sherman, said that he was in a meeting, and thought he heard an earthquake. However, the loud rumbling was actually the sound of people running away. As he fled, he reported seeing blood on the floor and the stairs.

"Heard people running because it was rumbling the floor. First thought was earthquake. After existing the room we still didn’t know what was going on but more people were running. Seemed serious and not like a drill. We headed towards the exit and then saw more people and someone said that there was a person with a gun. Shit.

"I looked down and saw blood drips on the floor and stairs. Peaked around for threats and then we headed downstairs and out the front. Police cruisers pull up, hopped out with rifles ready and I told them where the situation was as I headed down the street to meet up with a couple team members."

Sherman later tweeted that he was safely in an Uber on his way home.

Photos from the chaotic scene showed YouTube employees exiting the building with their hands over their heads. CNN reported that one woman suffering from a leg wound ran to the fast food restaurant Carl's Jr, and used napkins to stop the bleeding.  "I was trying to find tools to help her and I found a bungee cord and I tied that around her leg to stop the blood flow,"  said an employee at the restaurant. “She was scared." Another photo posted to social media showed the SWAT team arriving on site. The San Bruno Police are investigating the situation, and warning people to stay away from the intersection at Cherry Ave and Bay Hill Drive.

San Bruno is a suburb located about twelve miles from San Francisco. At least 1,700 people work on YouTube's campus. Google, which owns YouTube, issued a short statement on their communications and public affairs Twitter account: "Re: YouTube situation, we are coordinating with authorities and will provide official information here from Google and YouTube as it becomes available."

After getting briefed, President Trump tweeted about the shooting, thanking the police and sending "thoughts and prayers to everybody involved."

Our thoughts are with the victims and their families at this time.

A woman opened fire on campus at YouTube's headquarters in San Bruno, California. In a press conference, police confirmed that the shooter is dead from a self-inflicted gunshot wound. At least three people were wounded in the rampage and taken to Zuckerberg San Francisco General Hospital. A hospital spokesman told CNN affiliate KGO about the condition of three patients: a 36-year-old man in critical condition, a 32-year-old woman in serious condition and a 27-year-old woman in fair condition.

On Tuesday afternoon,YouTube  employees tweeted that they heard gunshots. Vadim Lavrusik, a product manager for YouTube, wrote, "Heard shots and saw people running while at my desk. Now barricaded inside a room with coworkers." Twenty minutes later, he tweeted that he had been safely evacuated.

Another product manager, Todd Sherman, said that he was in a meeting, and thought he heard an earthquake. However, the loud rumbling was actually the sound of people running away. As he fled, he reported seeing blood on the floor and the stairs.

"Heard people running because it was rumbling the floor. First thought was earthquake. After existing the room we still didn’t know what was going on but more people were running. Seemed serious and not like a drill. We headed towards the exit and then saw more people and someone said that there was a person with a gun. Shit.

"I looked down and saw blood drips on the floor and stairs. Peaked around for threats and then we headed downstairs and out the front. Police cruisers pull up, hopped out with rifles ready and I told them where the situation was as I headed down the street to meet up with a couple team members."

Sherman later tweeted that he was safely in an Uber on his way home.

Photos from the chaotic scene showed YouTube employees exiting the building with their hands over their heads. CNN reported that one woman suffering from a leg wound ran to the fast food restaurant Carl's Jr, and used napkins to stop the bleeding.  "I was trying to find tools to help her and I found a bungee cord and I tied that around her leg to stop the blood flow,"  said an employee at the restaurant. “She was scared." Another photo posted to social media showed the SWAT team arriving on site. The San Bruno Police are investigating the situation, and warning people to stay away from the intersection at Cherry Ave and Bay Hill Drive.

San Bruno is a suburb located about twelve miles from San Francisco. At least 1,700 people work on YouTube's campus. Google, which owns YouTube, issued a short statement on their communications and public affairs Twitter account: "Re: YouTube situation, we are coordinating with authorities and will provide official information here from Google and YouTube as it becomes available."

After getting briefed, President Trump tweeted about the shooting, thanking the police and sending "thoughts and prayers to everybody involved."

Our thoughts are with the victims and their families at this time.