Three people have been stabbed at a railway station in Paris.
The attack, at the major travel hub Gare de Lyon, ended when police arrested a suspect.
One person was seriously injured in the incident at around 7.35am local time (6.35 am in the UK). They are now undergoing surgery.
Paris police chief, Laurent Nunez, has said the attack does not appear to be terror-related, and has described the attacker as appearing to suffer from mental health issues.
He said the suspect was carrying residency papers from Italy and medicines suggesting he was undergoing treatment.
He is understood to have been armed with a knife and a hammer, and was tackled to the ground by a security guard according to the Paris prosecutor's office.
Police are now analysing the alleged weapons, and say they are looking at a preliminary charge of attempted murder.
French 24-hour-rolling news channel BFMTV has reported that the attacker is aged 32 and from Mali.
French Interior Minister, Gerald Darmanin, posted a message on social media, describing the attack as an "unbearable act" and thanking those who detained the assailant.
France's national railway company, SNCF, also posted on X to warn customers of disruption due to "an act of malicious intent".
It said halls one and three of the station were "temporarily inaccessible " due to intervention by the police and emergency services, with delays between Paris Gare de Lyon and Montargis, and between Paris Gare de Lyon and Montereau.
The Gare de Lyon is one of the busiest train stations in Paris. It is a hub both for high-speed trains that link the capital to other cities and for commuter trains that serve the suburbs and towns in the Paris region.
Security has been ramped up in Paris, ahead of its hosting of the Olympic Games at the end of July.
Around 10,500 Olympians and millions of visitors will attend the event, with the opening ceremony due to take place on 26 July.