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PARIS — A motorist deliberately drove his car into two police motorcyclists on patrol in a Paris suburb on Monday, gravely injuring both, police unions said. One of the officers sustained a fractured skull and has been placed in a medically induced coma.

The assault took place in Colombes, in the northwestern outskirts of Paris.

Video footage circulating on social media and on the website of a newspaper, Le Parisien, showed one motorbike sandwiched between the crumpled hoods of a police car and a black BMW. Debris from a second bike lay strewn on the road.

“Two police motorcyclists in a serious condition after being deliberately hit in Colombes by an individual who also rammed a police car. Thoughts with our colleagues,” the Synergie-Officiers union wrote on Twitter.

Police sources say the suspect, 30, was arrested at the scene and lived nearby in a working-class area close to where unrest erupted last week.