MONTREAL — Police officers in an off-island suburb of Montreal fatally shot a 15-year-old boy only 10 seconds after they parked their car on scene, the family’s lawyers alleged Tuesday as they announced a civil lawsuit against the officers involved and the city of Longueuil, Que.

The shots that killed Nooran Rezayi on Sept. 21 rang out less than three seconds after an officer could be heard on video yelling at a group of youths to get on the ground, according to the $2.2 million lawsuit.

Six members of Rezayi’s family allege Longueuil police used unreasonable and disproportionate force when they opened fire on the teenager. The allegations have not been tested in court.

The victim’s mother, Fahima Rezayi, described her son as a kind, cheerful and funny child who wanted a “simple, happy

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