One person has been killed and two police officers seriously injured in a knife attack in eastern France.
A man attacked people in Mulhouse, near the German border, at around 4pm on Saturday.
Prosecutors said a 37-year-old Algerian had been arrested and the person who died was a civilian who tried to intervene.
"Horror has just gripped our city," mayor Michele Lutz said on Facebook.
The man shouted "Allahu Akbar" ("God is greatest") as he attacked the police officers, prosecutors added.
President Macron told BFMTV it was "beyond doubt" it was an "Islamist terrorist act". He said the interior minister was heading to Mulhouse and would speak later.
The attacker is said to have been at a police station - where he was due to sign a document for his detention - but refused and ran into the market where he launched the attack.
One police officer was stabbed in the neck and another in the chest, according to French media. Three other police sustained very minor injuries.
Read more from Sky News:
Pope 'suffering more' and in 'critical condition'
Trump fires top US military officers
The knifeman had reportedly been under house arrest and was on a terror watchlist.
The French attack comes a day after a stabbing by a 19-year-old Syrian refugee at Berlin's Holocaust memorial.
A Spanish tourist was badly injured but is expected to survive.
The attacker is said to have wanted to kill Jewish people after being motivated by the conflict in the Middle East, according to prosecutors.
(c) Sky News 2025: One dead and police officers seriously injured in 'terror' stabbing in Mulhouse
Pope in critical condition and receiving blood transfusions after respiratory crisis, Vatican says
Israel postpones release of more than 600 Palestinian prisoners after 'humiliating hostage ceremonies'
Operation Iron Wall: West Bank areas 'turning into mini-Gaza' as Israeli troops bulldoze homes
Pay back the billions of aid, Trump tells Ukraine
Starmer's challenge is to see if usual rules of special relationship still apply under Trump after years of love bombing
On Air