The FBI has identified people who might have had a role in the bombings at the Boston Marathon, Homeland Security Secretary Janet Napolitano said Thursday while pleading for the public to be patient with the investigation.

Napolitano said the people are not suspects but represent one of the best leads in the federal investigation of the attack that killed three people and wounded more than 170.

“We have been collecting video from a variety of sources,” Napolitano said in testimony before the House Homeland Security Committee.

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