A man has died while two others were injured following a knife and hammer attack on a street in central Paris on Saturday.
The attack occurred near the Eiffel Tower.
A 26-year-old French national known to security services has been arrested, and anti-terrorism prosecutors have opened an investigation.
Officials confirmed that the man killed was a German national.
France's Interior Minister Gérald Darmanin says the victim was with his wife when he was attacked and fatally stabbed on Quai de Grenelle.
He says the wife's life was saved by the intervention of a taxi driver and that the suspect fled across a nearby bridge spanning the River Seine.
The minister says the man then attacked two more people, hitting one in the eye with a hammer.
A police operation was initiated around the Bir-Hakeim metro station on Saturday night, and authorities have urged people to avoid the area.
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