A series of violent incidents involving knife attacks in Paris has unfolded, including the stabbing of a police officer near Champs-Elysees by a 27-year-old man, who later died, suspected of killing a teenager earlier. Another knife attack near the same area led to a police officer shooting a man who had injured the officer. Additionally, a separate incident involved a man arrested on terrorism charges for attempting to murder a taxi driver while expressing support for Hamas. These attacks, occurring days before the Olympics, have heightened security concerns in Paris, with no confirmed terrorist motives in the incidents so far.