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Investigators are working to determine what drove someone to shoot dead a VA doctor in Texasbefore turning the gun on himself.  It happened yesterday at a VA medical center at Fort Bliss in El Paso.  The incident forced a lockdown at the hospital.  Authorities say the area where the shooting took place remains an active crime scene this morning and the FBI will head up the investigation.  Hundreds of potential witnesses are being tracked down and interviewed.   

PHOTO: Wikimedia Commons