BART tweeted out that a person on the tracks was killed.
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Trains were briefly being turned around before arriving at Bay Fair, but as of 3:09 p.m. they're single-tracking through the station, according to a BART spokesperson.
The Bay Fair station is now back open, but residual delays continue systemwide.
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Stay with ABC7 News for the latest details on this developing story.
Bay City News contributed to this report.