A screen grab shows a man armed with a knife running away after he attacked a group of pre-school children in the French Alps city of Annecy. AFP
The children were about three years old, police said.
A man armed with a knife attacked a group of children aged around three years old as they played in a park near the lake in the town at around 9:45 am (0745 GMT), a security source who asked not to be named and a local official told the media.
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At least three of the victims were in critical condition, the security source told AFP.
Prime Minister Elisabeth Borne's office announced she was travelling to the scene and MPs in the national parliament held a minute's silence as news of the attack broke in the French media.
BFM TV reported that the assailant had been a Syrian asylum seeker.
Agencies