President Barack Obama vows justice for Boston blasts

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by Chris Patterson

WASHINGTON (CNN) -- President Barack Obama said Monday he ordered the "full resources" of the federal government to respond to the Boston bombings on Monday, and that he also called for increased security around the United States as necessary.

Pledging a full investigation to find out what happened, Obama said any individuals or groups responsible for what he called "senseless" violence will "feel the full weight of justice."

The president spoke to reporters at the White House a few hours after explosions rocked an area near the finish line of Monday's Boston Marathon.