Witnesses to the sniper attacks in Maryland and Virginia described seeing a white work van in the vicinity of the incidents. As a result of this, dozens of reports of suspicious white vans were received, even though the vans were behaving in perfectly normal way. Because the snipers actually drove a dark sedan, they were able to continue their terrible deeds longer. The people trying to solve the crime were operating under

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The investigators were influenced by a mental set, focusing on the white van due to witness reports, which led them to overlook other possibilities, such as the dark sedan actually used by the snipers.

Witnesses to the Sniper Attacks in Maryland and Virginia Described