In a 5-4 vote, the US state's Supreme Court said the lawsuit could proceed on the basis of state consumer protection laws.

The gun was used by Adam Lanza, who killed 27 people, including 20 elementary school students.

The ruling is a rare legal defeat for an arms firm in a mass shooting case.

The lawsuit, by relatives of nine victims and one survivor, points to the "militaristic" marketing of Remington's AR-15 rifle.

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