ABC7's Dion Lim met a woman who said her 30-year-old son is a software engineer at YouTube. She says he texted to say he was hiding after hearing gunshots while on the campus' lunch patio.
In one of his messages he wrote, "I love you all, I am safe for now."
Other employees reported that they were asked to keep messages to a minimum during the active situation.
Watch the video player above for Dion's full report.
Click here for full coverage on the shooting at YouTube's headquarters.