More than 200 U.S. mayors are urging Congress to repeal a piece of legislation limiting the release of information that would allow authorities to track firearms. The original sponsor of the limits and a mayor discuss the law's merits.

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British authorities on Thursday arrested 21 people reportedly planning to detonate explosives aboard aircraft flying from the UK, prompting U.S. officials to raise the terror alert to "red," its highest level yet, for commercial flights from Britain.

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