Loud noise triggered security alert at U.S. White House

March 7, 2015 5:40 PM

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WASHINGTON, March 7 (Reuters) - A security lockdown at the White House triggered by a loud bang just as President Barack Obama was due to leave was caused by a food vendor cart catching fire on a nearby street, the Secret Service said on Saturday.

The security alert happened just moments before Obama and his family had been due to board a helicopter from the presidential mansion's South Lawn for Andrews Air Force Base.

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