The TAP report on Sunday said unidentified militants planned to attack "sensitive sites" in the city with car bombs and explosive belts. The report cited an unnamed Interior Ministry official.
It added that police had banned traffic on Bourguiba Avenue in the heart of downtown and nearby streets to prevent attacks.
There have also been increased police patrols and raids around the capital and its suburbs.
In March and June, gunmen attacked the national museum and a beach resort killing nearly 60 foreign tourists. The attacks were claimed by the Islamic State group.
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