A French soldier was stabbed outside a big train station in Paris on Monday and the attacker was arrested, officials said, while the city was under a high security alert 11 days before the opening ceremony of the 2024 Olympics.

A French military official said the soldier was hospitalised but is not in life-threatening condition, and that the reason for the attack is being investigated. The official was not authorised to be publicly named. The soldier was among thousands of troops serving in the Sentinelle force for France's domestic security.

Interior Minister Gerald Darmanin posted on X that the soldier had been patrolling at the Gare de l'Est train station in eastern Paris, and that the assailant was detained.

Paris is deploying around 30,000 police officers each day for the Olympics, which run from July 26 to Aug 11, with a peak of 45,000 for the opening ceremony on the Seine river. About 18,000 members of the military are also helping ensure security.

Soldiers in the Sentinelle force have been targeted in the past.