As Americans gathered to celebrate United States' 250th birthday, a severe weather warning forced evacuation at the National Mall in Washington, D.C., prompting authorities to delay some events. 
As Americans gathered to celebrate United States' 250th birthday, a severe weather warning forced evacuation at the National Mall in Washington, D.C., prompting authorities to delay some events. 
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As Americans gathered to celebrate United States' 250th birthday, a severe weather warning forced evacuation at the National Mall in Washington, D.C., prompting authorities to delay some events.&nbsp;
