UPDATED: 04/20/17, 8:19PM

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PARIS (CBSDFW.COM) –  The Islamic State of Iraq and Syria (ISIS) has claimed responsibility for the attack on police in Paris’ iconic Champs-Elysees shopping district Thursday night, killing one officer and seriously wounding two others before police shot and killed him.

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Investigators were conducting searches early Friday in at least one eastern suburb of Paris, according to three police officials. Authorities were trying to determine whether the assailant had accomplices, anti-terrorism prosecutor Francois Molins told reporters at the scene.

The attacker emerged from a car and used an automatic weapon to shoot at officers outside a Marks & Spencer’s store at the center of the Champs-Elysees, Molins said. Two police officers and a woman tourist were wounded, he said.

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The attacker had been flagged as an extremist, according to two police officials, speaking on condition of anonymity because they were not authorized to publicly discuss the investigation.

A French government spokesman says the assailant opened fire on a Paris police van and was armed with an automatic firearm akin to a “war weapon.”

French Ministry spokesman Pierre-Henry Brandet said the police officers were “deliberately” targeted.

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