
Paris police said officers quickly detained the attacker who used a sharp weapon in the assault at around 8 a.m.
One of the people injured was in a serious condition; the other two were more lightly hurt.
Police had no other immediate details.
Posting on social media, Interior Minister Gerald Darmanin described the attack as an "unbearable act" and thanked those who detained the assailant.
Security in Paris is being ramped up as it prepares to welcome 10,500 Olympians and millions of visitors for the first Olympic Games in a century in the French capital.
The Games are to open with a massive open-air ceremony along the River Seine on July 26, a major security challenge in the city that has been repeatedly hit by terror attacks, most notably in 2015.












Comment: Day by day the dollar loses its relevance, and day by day the US tries to wreck the global economy to prevent it.