Completing their investigation of the crime scene early Wednesday, San Bruno police are probing the background of the California woman they believe opened fire Tuesday at YouTube headquarters, wounding three before taking her own life.

According to The Mercury News, San Bruno police Chief Ed Barberini told reporters early Wednesday that they completed their forensic examination at YouTube headquarters and turned the building back over to the company.

“My understanding is that the building will be closed for a couple of days,” he said of the Cherry Avenue campus. “I believe they’re redirecting employees to other campuses.”

Barberini also confirmed that they’re now investigating shooting suspect Nasim Aghdam, 39, and have impounded her car. Aghdam had expressed anger at YouTube over how the company treated her video content, he said. According to NPR, that Aghdam accused the video-sharing service of demonetizing and censoring her videos.

The Sacramento Bee reported that agents with the U.S. Bureau of Alcohol, Tobacco, Firearms, and Explosives are searching Southern California homes where Aghdam possibly lived or stayed. While officials haven’t confirmed where these homes are located, the newspaper wrote that agents were spotted entering homes in the communities of Menifee and 4S Ranch early Wednesday.

ATF agents are also interviewing the woman’s family at their Menifee home, according to SFGate. Agents have been seen at the home since Wednesday morning but also declined to answer questions regarding their presence.

Meanwhile, a neighbor of the Aghdams told SFGate that he didn’t know the suspected shooter personally and hadn’t seen her in recent months. The neighbor claimed he last saw her painting green trimming on the family home. He reportedly went on to describe the suspect’s father, Ishmail Aghdam, as a nice, friendly man.

[Featured Image: Nasim Aghdam/San Bruno police]