The San Bruno Police Department released new details on what led up to a shooting at YouTube’s headquarters in early April. 

According to the San Bruno Police Department, Nasim Najafi Aghdam,39, was reported missing to the San Diego Sheriff’s Office by family members on Sunday, April 1, 2018. 

Aghdam was last seen by family members on Mar. 31, 2018. 

Authorities say on April 2, 2018, at around 12:40 p.m. Aghdam visited the YouTube campus in San Bruno.

She was there for about 10 minutes and spoke with employees at the site, officers said.

Aghdam asked for directions to the main office and was directed to the front desk where she inquired about job opportunities.

The following day, on April 3, 2018, at around 1:40 a.m. Mountain View Police found Aghdam sleeping in her vehicle that was located in a Walmart parking lot. 

Aghdam told police that she left home after an argument with family members. 

Mountain View police determined that she was not in need of assistance and removed her from the statewide missing persons system. 

Officers later notified Aghdam’s family that she had been found and was unharmed. 

On the same day around 11:03 a.m. she visited the Jackson Arms Shooting Range located at 152 Utah Avenue in South San Francisco.

Investigators say she practiced shooting for a time with a pistol and left at 11:39 a.m. 

At approximately 12:43 p.m., Aghdam arrived at the YouTube campus and entered a parking garage on foot from Bayhill Drive.

She was carrying a purse over her left shoulder and walked directly to a pedestrian door leading to a courtyard area between the parking structure and the YouTube building, police said.

Moments later, Aghdam was contacted by an employee who requested that she show her YouTube identification badge. 

 She ignored the employee, reached into her purse with her right hand, and removed a pistol, authorities said.

After seeing the gun, the YouTube employee fled and called 911.

Aghdam walked east through the courtyard and began firing indiscriminately into a crowd of employees eating lunch.

She emptied her pistol of ammunition, reloaded another magazine, and continued firing at the building and into the crowd.

Police said as Aghdam approached the entrance to the building, she turned the pistol on herself, firing it into her chest.

Investigators found 27 shell casings at the scene and one round remained in the firearm.

The firearm used during the commission of this crime was a Smith and Wesson 9mm Model SD9VE Semi-Automatic Pistol.

The gun was registered to Aghdam. She had purchased the handgun from “The Gun Range” in San Diego, California on January 16, 2018.

Investigators say although the investigation is ongoing it appears that Aghdam acted alone. 

They believe the primary motive for the crime was her displeasure with YouTube’s business practices.