Richardson Police are seeking four thieves who robbed a wholesale jeweler of about $800,000 worth of precious gems as he arrived in the back alley of a jeweler.

    

Richardson police say the attack was captured on surveillance video.
    Sgt. Kevin Perlich says a wholesale jeweler from San Francisco was jumped by three men after arriving late Wednesday afternoon. The thieves took a small suitcase containing the jewelry, then fled in a vehicle driven by the fourth suspect.
   Police say the jeweler was not hurt. Perlich says the suspects wore hoodies and sweat shirts and at least one had a knife.