The West Oakland BART Station was closed and trains were not stopping there due to unspecified police activity Tuesday night, officials said. The transit agency sent an alert out to riders just before 8:15 p.m., informing them of the station closure, though they offered no details as to why the station was closed or when it would reopen. A dispatcher with BART police said that details would be forthcoming, but that the situation was “still evolving.” Check back for updates. Kale Williams is a San Francisco Chronicle staff writer.