NEWARK, N.J. -- U.S. Sen. Cory Booker (D-N.J.) is under increased security after someone threatened to kill him and his family, CBS New York reports. Mayor Ras Baraka said local police were guarding his Newark home Saturday as a precaution.

According to the Baraka, U.S. Capitol Police notified the Newark Police Division about the threat, CBS Philadelphia reports.

Federal agents were also helping provide the additional protection.

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The exact nature of the threat has not been made public.