U.S. Marks July Fourth Amid Worries Over Security, Sharks, Wildfires

Millions of Americans readied on Saturday for Independence Day parades and firework shows amid worries over possible security threats, a spike in shark attacks on East Coast beaches and the danger of wildfires in the West.
The Department of Homeland Security and the Federal Bureau of Investigation have issued an alert asking local authorities and the public to remain vigilant for possible threats following recent calls for violence by Islamic State leaders.

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