From France to the U.S. terrorists 'known to authorities' carry out deadly attacks

by Leandra Bernstein

Fri, April 21st 2017, 9:09 PM UTC

Police forces take positions on the Champs Elysees avenue in Paris, France, after a fatal shooting in which a police officer was killed along with an attacker, Thursday, April 20, 2017. An attacker with an automatic weapon opened fire on police on Paris' iconic Champs-Elysees Thursday night, killing one officer and seriously wounding two others before police shot and killed him. (AP Photo/Kamil Zihnioglu)

FILE - In this Dec. 31, 2016 file photo, a hooded police officer runs prior to the visit of France's President Francois Hollande in Paris. With the scars and threat of extremist violence looming over France's presidential election, voters will cast ballots under a state of emergency that is becoming a part of the fabric of French life. (AP Photo/Thibault Camus, Pool, File)

This photo provided by the AP on the condition that its source not be revealed, shows Karim Cheurfi. A gunman opened fire on police on Paris’ iconic Champs-Elysees boulevard Thursday night, April 20, 2017. Police have searched a home in a suburb east of Paris believed linked to the attack on police on the Champs-Elysees. A police document obtained by The Associated Press identifies the address searched in the town of Chelles as the family home of Karim Cheurfi, a 39-year-old with a police record. (AP Photo)

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Police forces take positions on the Champs Elysees avenue in Paris, France, after a fatal shooting in which a police officer was killed along with an attacker, Thursday, April 20, 2017. An attacker with an automatic weapon opened fire on police on Paris' iconic Champs-Elysees Thursday night, killing one officer and seriously wounding two others before police shot and killed him. (AP Photo/Kamil Zihnioglu)

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