Gare de Lyon, one of Paris' main train stations, was evacuated Friday afternoon following a bomb alert, Xinhua news agency reported.
Hundreds of passengers were forced to leave the station after a bomb threat had been posted on social networks, police said.
"Everything has returned to normal. Passengers can again enter the station and trains run again," state-run railway company SNCF was quoted as saying.
France has been on high alert since the Charlie Hebdo series of attacks in January 2015.
The government is keeping security at the highest level and has deployed 10,000 soldiers across the country to ensure security, mainly of sensitive places such as religious centers.