OAKLAND — An ex-convict from Los Angeles has been charged in an unprovoked attack last week on a BART train passenger in Oakland that left the victim with broken bones and severe cuts, according to authorities and court records.

The suspect, Tommy Navarrette, 44, was charged Tuesday with assault with a deadly weapon. The complaint states he used a metal chain to inflict great bodily injury to the man attacked.

The attack happened just after 6 p.m. Feb. 11 on board a BART train bound for Daly City as it traveled through Oakland. Navarrette boarded the train at the Coliseum Station and the victim, a 38-year-old San Francisco resident who he did not know, boarded at the Fruitvale Station.

The attack, which authorities said was unprovoked, happened after Navarrette reportedly asked the victim for directions.

According to court documents, the victim was repeatedly punched in the face by Navarrette, taken to the floor of the train where he was bitten on the back and struck in the head with a metal lock attached to a chain.

Navarrette fled the train at the Lake Merritt Station.

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After BART released video and still photos of Navarrette to the media and other law enforcement agencies, he was arrested by the California Highway Patrol on Feb. 13. He underwent a psychiatric evaluation before charges were filed, authorities said.,

According to court records, Navarrette received a prison term after being convicted of criminal threats in Los Angeles County in August 2015. He also has a July 2017 conviction for possession of nunchaku and an August 2017 conviction for assault with force likely to create great bodily injury, both in San Diego County for which he was placed on probation. He is being held at Santa Rita Jail in lieu of $275,000 bail.