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French police officials gather at the entrance to Notre-Dame cathedral in Paris on June 6, 2017. 
A French police officer has shot and injured a man who attacked him with a hammer outside Paris's Notre-Dame cathedral authorities said. Police sealed off the area in front of the cathedral, where the attacker lay injured on the ground.
 / AFP PHOTO / bertrand GUAY        (Photo credit should read BERTRAND GUAY/AFP/Getty Images)
French police officials gather at the entrance to Notre-Dame cathedral in Paris on June 6, 2017. 
A French police officer has shot and injured a man who attacked him with a hammer outside Paris's Notre-Dame cathedral authorities said. Police sealed off the area in front of the cathedral, where the attacker lay injured on the ground.
 / AFP PHOTO / bertrand GUAY        (Photo credit should read BERTRAND GUAY/AFP/Getty Images)

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One witness explains the scene near the Notre-Dame Cathedral in Paris where a man is said to have attacked police with a hammer.

Witness: We saw blood on suspect

One witness explains the scene near the Notre-Dame Cathedral in Paris where a man is said to have attacked police with a hammer.