Voice of America reported French police directed about 1,400 people to leave the popular tourist attraction after a threat was phoned in. The L'Express news website said people were told to leave the tower about 7 p.m. local time, the BBC reported.
The tower was reopened about 2 hours later after a search with sniffer dogs produced no evidence of a bomb, VOA said.
The BBC reported authorities set up a security perimeter around the monument.
The Eiffel Tower has been targeted by threats several times in recent years.