Earlier in the day, the Charing Cross station had been evacuated and closed as a precaution following reports of a man going onto the tracks and claiming to have a bomb.
"Officers are currently assisting the British Transport Police at Charing Cross train station following a report of a man acting suspiciously. The station has been evacuated as a precaution and is currently closed," Scotland Yard said.
A few minutes later the Transport Police announced that the suspect had been arrested.
Witnesses said they saw several police vehicles going down the street to Charing Cross station.
No injuries have been reported as a result of the incident.
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The terror threat has remained high in the European Union in recent years. The United Kingdom has faced a number of bloody terror acts, most notably the attack on London's Westminster Bridge and parliament grounds in March 2017, as well as a concert bombing in Manchester on May 22, 2017.