President Obama vowed today that whoever is responsible for the bombing that killed at least three people at the Boston Marathon "will feel the full weight of justice."
"We still do not know who did this or why, and people shouldn't jump to conclusions before we have all the facts, but make no mistake, we will get to the bottom of this, and we will find out who did this," Obama said, offering condolences to victims and their families and praising first responders.
"We will find out why they did this. Any responsible individuals, any responsible groups will feel the full weight of justice," Obama said.
The president was briefed within minutes of the explosions that killed at least three people and injured more than 130 more near the finish line of the marathon, as the federal government boosted security measures and offered pledges of law enforcement support to the investigation.