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Armed with a new state law, pro-gun groups are rapidly scaling up their attack on municipal firearms ordinances in Pennsylvania, with the National Rifle Association filing suit over gun-control measures in three cities.

The cities of Philadelphia, Pittsburgh and Lancaster have “openly defied” a 40-year-old state law that forbids municipalities from regulating firearms, said Chris Cox, executive director of the NRA’s Institute for Legislative Action.

The lawsuit against Lancaster was filed late Tuesday and was released by the NRA on Wednesday. The group also filed legal paperwork in Philadelphia and Pittsburgh courts and was awaiting confirmation those lawsuits had been accepted.

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