A K-9 also alerted Secret Service agents to a vehicle on 16th Street and Constitution Avenue, law enforcement officials said, but did not provide further details.

White House is locked down, press being held inside. SOP for fence jumper, suspicious pkg, etc. Not too uncommon.

— Chris Good (@c_good) March 7, 2015

View from inside WH briefing room w/ pool reporters & crews locked down & held inside, filming Secret Svc on N Lawn pic.twitter.com/Jm8r5JAlyW

— Chris Good (@c_good) March 7, 2015

The first family will be in Selma later today, where President Obama was to make make a speech for the 50th anniversary of \"Bloody Sunday,\" a landmark event of the civil rights movement.

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