I grieve with you, he continued.
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He said the situation was fluid, and that the investigation was at the preliminary stage.
Joe BidenSAUL LOEB/AFP via Getty Images
The man thought to have driven the truck was American citizen who was born in TX.
The suspect served in Army for many years and also in Army Reserve until a few years ago.
Biden confirmed that an Isis flag was found in his vehicle along with possible explosives.
More explosives were found nearby.
The president said there was no indication so far that they were related.
