PARIS – Police carried out raids across France on Saturday after DNA on a grenade that exploded last month at a kosher grocery store led them to a suspected jihadist cell of young Frenchmen recently converted to Islam.

The man whose DNA was identified, named by police as Jeremy Sydney, was killed by police after he opened fire on them, slightly wounding three officers in the eastern city of Strasbourg. Officials said he had been under surveillance since last spring – around the time a French Islamic went on a shooting rampage against a Jewish school and French soldiers, killing seven people.

Eleven other suspects were arrested across the country Saturday, according to the Sipa news agency. One man was carrying a loaded gun, and police found weapons, cash and a list of Paris-area Israeli associations during the raids.