A murder investigation into a fatal shooting on San Francisco's BART train has hit a delay after cops found that security cameras inside the carriage were actually decoys.
Passengers feared they were under attack by a terrorist after the gunman shot dead a fellow rider on the packed train on Saturday night.
The suspect fled the Bay Area Rapid Transit (BART) train at the West Oakland station as some passengers frantically tried to save the shooting victim. He later died at the scene.
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