An assailant attacked a soldier on a counter-terrorism patrol in Paris on Friday, France’s armed forces minister said, the latest in a series of strikes targeting troops protecting transport hubs and tourist sites.

The assailant was wrestled to the ground before being detained. The soldier, part of Operation Sentinel, a force deployed in the wake of Islamist attacks was unhurt in the incident.

It happened at the Chatelet subway station, a busy central hub for the metro and the suburban RER rail network that carries commuters into the capital from the capital’s sprawling suburbs.

“The man was arrested,” Armed Forces Minister Florence Parly told news men shortly after the attack. She said she had no further details on the assailant or his motives.

French media reported he was armed with a knife.