Nearly 1,400 people were sent away from the tourist attraction following a request from tower operators after an anonymous caller phoned in the threat.
Police then searched the monument with sniffer dogs, and set up a security perimeter. No explosives were found.
French authorities have stepped up counterterrorism measures in recent weeks amid heightened concern about threats to France over its military campaign against al-Qaida-linked fighters in Mali which began more than two months ago.
The tower is occasionally evacuated because of such warnings -- at least once last year and twice in 2011. The 324-meter (1,063-foot) tower is one of the world's top tourist attractions, with millions of visitors a year.
