SACRAMENTO(TIP): Details are emerging about the woman behind the YouTube headquarters shooting Tuesday, April 3 that injured three people in San Bruno, California. Police said Thursday, April 5 that Nasim Aghdam legally purchased the firearm in San Diego on January 16, 2018 from a gun dealer in her name.

It was a 9mm Smith and Wesson that had a capacity of 10 rounds. San Bruno police confirm that one of the magazines was empty and that Aghdam loaded a second to fire more shots at YouTube employees before she turned the firearm on herself.

However, authorities have not been able to confirm how many total shots were fired and that there is a possibility that the first magazine may have not been fully loaded.

Authorities have promised a deeper investigation into the shooter’s past and her anger with the policies of the world’s largest online video website, identified as her motive for attacking it.

Aghdam, an Iranian native in her late 30s, walked through a parking garage into a courtyard at the campus Tuesday and opened fire, police said. She wounded three people before killing herself.

YouTube said Wednesday it will increase security at its headquarters and offices around the world.