The following is via ABC News:
Federal authorities are warning that white supremacists and other political radicals could look to attack Independence Day revelers on July 4, noting in a bulletin to law enforcement around the country that domestic terrorists “have attacked perceived oppressors, opponents, or enemies engaged in outdoor First Amendment-protected rallies or protests during past summers.”
The warning came in a joint intelligence bulletin issued by the FBI, Department of Homeland Security and National Counterterrorism Center, urging law enforcement personnel to remain vigilant for suspicious activity.
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