How Do I Report a Dangerous AT&T Driver?

Witnessed an AT&T employee running a red light, endangering cyclists and pedestrians today in SF. 

Intersection of Powell & Market in SF on Feb. 8, 2016 at approx. 4:50PM; vehicle license [edited for privacy – please do not post personal information].

Here's the video:

https://youtu.be/4Hl1XgLXSrY