An unknown caller made a terrorist threat against the Rockwall County Republican headquarters Tuesday, authorities said.

The threat comes on the heels of Saturday's firebombing and vandalizing of a GOP office in North Carolina.

The Rockwall Police Department and Rockwall County Sheriff's Department responded about 11 a.m. to a report of a threat against the office at 112 Kenway St.

The two departments are cooperating in the investigation, with help from the FBI.

Anyone with information is asked to call Rockwall police at 972-771-7724 or the Rockwall County Sheriff's Department at 972-204-7001.