Police officers rushed to California Youtube headquarters last April 3, 2018 due to a report of shooting incident. When they arrived the place is in chaos, people are fleeing away from the building to avoid the killer. What was surprising in the incident is that the shooter is a woman and was dead due to self-inflicted wound.
More information about the news here:
https://www.livescience.com/53047-why-female-mass-shooters-are-rare.html