US Senator Scott Brown said Monday that it should be left up to lawmakers in individual states to decide whether to approve new bans on assault weapons. The senator’s comments follow a shooting rampage in Colorado that left 12 people dead and 58 others injured at a midnight screening of ‘‘The Dark Knight Rises.’’ The shootings also prompted supporters of tighter gun laws to renew their call for the reinstatement of a federal ban on 19 types of military-style assault weapons.
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