I can't find this incident in Grenoble in any English language news sites. I don't really expect to - it's local news - nothing to see here. Actual stabbing murders in London don't make the provinces, and those in Birmingham and Manchester don't make the south. All part and parcel of life in a big city. Although it wasn't so when I was young and London was the second biggest city in the world.
But it did make a French daily, Le Parisien, 20 Minutes Actu, a North African newspaper Bladi (Moroccans around the World) (the young man is Algerian) and ACTU Penitientiary, a website for the various offices of law, order and justice in France. They have video.
To paraphrase, on Sunday 27th October a young man aged 19, of Algerian ethnicity and bare chested caused concern in the area around Grenoble Railway station by brandishing two large kitchen knifes while shouting Allah Akbar.
Police Officers of the Anti-Crime Brigade of Grenoble quickly had him on the floor and under arrest. From the video I think they shot him with some kind of stun gun/taser type thing.
He has been taken to a psychiatric hospital. Of course he has. Instructions from the public prosecutors office are awaited.