Investigators led by the FBI's joint terrorism task force sought clues on Thursday to what drove an Afghan immigrant to open fire on two National Guard soldiers mere blocks from the White House in what officials called an "ambush" attack on Thanksgiving eve.

The two soldiers, part of a militarized law enforcement mission ordered by President Donald Trump months ago and challenged in court by officials of the District of Columbia, were hospitalized in critical condition.

The suspect, who was wounded in an exchange of gunfire before he was arrested, was identified by the Department of Homeland Security as Rahmanullah Lakanwal, an Afghan national.

Trump, who was at his resort in Florida at the time of the attack, released a prerecorded video statement late on Wednesday calling the shooting

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