The US's most powerful pro-gun lobbying group is suggesting that armed police be deployed to every school in the country following a mass shooting that left 20 young children dead. The National Rifle Association, which supports a broad interpretation of US citizens' constitutional right to bear arms, had been under pressure to respond in the wake of last week's massacre in a Connecticut elementary school. Even as the NRA leaders made their combative and determined appearance, another four people died in Pennsylvania in America's latest shooting spree, including the alleged shooter.