Melgar said the suspect ran out of the train at Castro station and was still free, but stressed that police did not treat the incident as an active shooter situation. “We have a lot of guns out there,” Melgar said in a subsequent tweet. “Too much.” Melgar told The Chronicle that the shooting was not accidental and that the suspected gunman and another man had a heated argument before the fire. “The gunman pulled out a gun and shot the man he was arguing with,” Melgar said. “The second victim was not involved in the verbal dispute, but happened to be right next to the other victim.” It was not clear if the shooting of the second victim, a woman, was accidental, he said. The female victim is the one who survived her injuries. Police are currently investigating witnesses and have closed the Castro Street station to gather evidence, Melgar said. City officials on Wednesday morning urged residents to avoid the area between Castro and Market streets due to police activity and said buses were being set up to transport people from the West Portal to Embarcadero / Folsom streets. San Francisco police did not immediately respond to a request for comment.

This is a story that is evolving and will be updated. Megan Cassidy is a staff writer for the San Francisco Chronicle. Email: [email protected] Twitter: @meganrcassidy