DALLAS - Police have hurriedly blocked off streets surrounding department headquarters after receiving a "credible" threat.

Authorities aren't releasing details but rapidly established a perimeter of several blocks around the department.

Return for updates.

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools