Digital Design & Imaging Service Inc. estimated around 200,000 people attended the rally, CBS News reported. Organizers on Saturday estimated 800,000.
Washington, D.C., metropolitan police have yet to release their own estimates.
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The respected imaging firm uses balloons to fly cameras over events in order to estimate crowd size. The service said there was a margin of error of 15 percent for their estimation. The crowd size was largest at 1 p.m., the company said.
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