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      White House goes on lock down; two detained

      For the second time in three days, the White House has been put on lockdown because of a security breach.

      The Secret Service says two people threw something over the fence surrounding the White House complex - one person from the south side and one from the north.

      The two have been detained and questioned.

      The incident follows an hour-long lockdown Tuesday after a vehicle followed a motorcade bringing President Barack Obama's daughters home through the gates.

      The driver was charged with unlawful entry, a misdemeanor.