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In page D.C. sniper attacks:

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Police had only a few pieces of evidence to work with. One initial report said that right after the Silver Spring attack, someone had reportedly heard a popping noise and had seen a white box truck hurriedly leaving the scene.[6] After the murder in Washington, D.C., witnesses began telling police that they had seen a blue Chevrolet Caprice rather than a white box truck. The police initially believed that all of the murders were carried out with a .223 caliber rifle.[citation needed]