Ofc. E. Teper says:

Shots Fired:
On June 25th at 7:30 pm, officers responded to Pennsylvania and Mariposa on a call of shots fired. They met with several witnesses that saw a suspect on the overpass in the area shooting at a passing Cal Train. After shooting at the train, the suspect was seen placing his gun into a bag and walking away from the scene west on Mariposa to north on Pennsylvania. The officers searched the area for possible victims, finding none. The officers also contacted the San Mateo County Sherriff who located the victim train and found that it sustained no damage as a result of the shooting nor were there any victims aboard. No injuries were reported as a result of this incident. Shell casings were recovered from the scene of the incident. The officers searched the area for the suspect but could not locate him that evening. This incident is under investigation.
(SFPD Case No. 120500756)