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Ed Donovan, a spokesman for the Secret Service, said incidents of firearms being carried outside presidential events are a "relatively new phenomenon." But he said the president's safety is not being jeopardized.

"We're well aware of the subjects that are showing up at these events with firearms," he said. "We work closely with local law enforcement to make sure that their very strict laws on gun permits are administered. These people weren't ticketed for events and wouldn't have been allowed inside and weren't in a position outside to offer a threat."