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"I just don't know... I have no idea."
A friend of Aaron Alexis, the man officials have identified as the dead Navy Yard shooter, speaks to CNN's Ed Lavandera in Ft. Worth, Texas.
CNN's Brian Todd talks with those who witnessed the Navy Yard shooting in Washington and lays out a timeline of events.
Navy Captain Mark Vandroff describes how he and others barricaded themselves in a conference room during the shooting.