BART police officer involved in fatal shooting outside West Oakland Station

A BART police officer was involved in a shooting outside the West Oakland Station Wednesday evening that killed one man and sent another to the hospital with serious injuries, authorities said.

What happened at Seventh and Chester streets, across from the West Oakland BART Station and in front of the Upperkutz barbershop, remains unclear, and Oakland police said they wouldn’t offer any more details before Thursday morning.

But one witness told The Chronicle she saw two men arguing before shots rang out. Another said she saw one man shoot the other in the leg, prompting a BART police officer to run across the street from the station and shoot him.

Evidence markers can be seen on the ground where Oakland police say a BART officer-involved shooting took place outside of the West Oakland BART station. Evidence markers can be seen on the ground where Oakland police say a BART officer-involved shooting took place outside of the West Oakland BART station. Photo: Kimberly Veklerov / San Francisco Chronicle Photo: Kimberly Veklerov / San Francisco Chronicle Image 1 of / 10 Caption Close BART police officer involved in fatal shooting outside West Oakland Station 1 / 10 Back to Gallery

A video posted on Facebook, apparently from someone inside the barbershop, shows the chaotic aftermath of the shooting with two bodies on the sidewalk and people wandering through the crime scene, talking to and approaching the victims.

The shooting took place at 4:41 p.m. across Seventh Street from the station entrance, Oakland police said. Officer Johnna Watson, Oakland Police Department spokeswoman, said in a statement that BART police reported that one of their officers had been involved in a shooting and requested Oakland’s assistance.

“Upon arrival, Oakland police officers learned that an on-duty BART PD officer, dressed in full police uniform, discharged their service firearm and two adult males were transported to a local hospital for medical attention,” Watson said.

At about 6:30 p.m., Watson reported that one of the two men had died at the hospital. The other was in stable condition.

A handgun was found on the ground at the scene, she said.

A witness who identified herself only as Quinn, 32, of Oakland, said she was eating in a Mexican restaurant on Seventh Street when she witnessed an argument between a man in his 20s and another in his late 30s as they walked in and out of the business.

The younger man was shooting video of the older one on his phone as they argued. Maybe a minute after they exited the restaurant, Quinn said, she heard one gunshot and then, after a brief pause, five or six more.

Quinn said she hid in the rear of the restaurant and then emerged moments later and saw the younger man on the ground, obviously shot.

“Everybody was standing around, and I yelled, ‘Is anybody going to do CPR?’ Nobody did anything,” she said.

She attempted CPR, Quinn said, and BART police pushed her away. It seemed to her that the younger man was dead, she said. The older man was on the ground 2 feet away, handcuffed, she said.

Another witness, Laquisha Stanley said she was at a nearby doughnut shop when she noticed a friend get into a dispute with a man he knew. The pair walked down the street, arguing, she said, and the other man shot her friend in the leg.

A BART police officer who was watching from the station’s parking lot ran over and shot the man who fired the gun, Stanley said.

“It’s a sad situation, because it’s the third of the year,” she said. “We haven’t even finished the first week and we have another killing. ... They both lost today.”

BART said the West Oakland Station remained open and that train service was not affected. Some commuters, however, were unable to get to their cars during the investigation.

Kimberly Veklerov and Michael Cabanatuan are San Francisco Chronicle staff writers. Email: kveklerov@sfchronicle.com, mcabanatuan@sfchronicle.com Twitter: @KVeklerov, @ctuan