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Zachary McCabe (BART Police)

PLEASANT HILL -- A BART passenger used a stun gun on one of two men fighting over a seat on a San Francisco-bound train Wednesday morning, police said.

Officers responded at 7:39 a.m. to the Pleasant Hill station for a report of two passengers arguing over the seat on a train headed into the city, said Lt. Aaron Ledford.

One passenger, whom police identified as 30-year-old Zachary McCabe, got into a fight with a 62-year-old man and became irate, Ledford said.

When the older man tried to call police, McCabe allegedly took a swing at the victim then put him in a headlock, police said.

A handful of patrons then intervened and separated the two men, including the passenger who used a stun gun, Ledford said.

When the train stopped at the Pleasant Hill station, officers on scene boarded the train, detained McCabe and arrested him on suspicion of battery on a transit passenger.

The older man, who was not seriously injured, was checked out by paramedics at the scene.

It wasn't until after officers interviewed witnesses that they learned one of the passengers who helped break up the fight had used a stun gun on McCabe.

"They found out at some point someone used a stun gun to help get the suspect off the victim," Ledford said. "That person didn't come forward so we were not able to interview them. We'd love to talk to them."

It's not likely the person who assisted will be charged either, police said.

"In a case like that they're basically coming to the defense of the gentleman in a headlock and it's not illegal to possess (a stun gun) unless you're a felon or you're a minor."

McCabe was taken to a hospital to be treated for his injuries and was then transported to jail, police said.

If convicted, he faces up to a year in jail and a $10,000 fine.

Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.