Officials are investigating the shootout in a kosher grocery in Jersey City, N.J., as a potential act of domestic terrorism, and recovered several hundred shell casings along with a cache of rifles and handguns from the scene, they said.

Law-enforcement officials said the assailants, David Anderson and Francine Graham, were armed with a 12-gauge shotgun, two .9mm handguns, a .22 caliber handgun outfitted with a homemade silencer and an AR-15-style weapon, a rifle that has been used in many mass shootings. Ms. Graham legally…

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