Explosions at the Boston Marathon

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 UPDATED 6:57 p.m. EDT: Police officials have confirmed that one of the victims killed by today's Boston Marathon bombing was an eight-year-old. At least two people are reported dead, and as many as 100 were injured.

UPDATED 6:22 p.m. EDT: In remarks to reporters from the White House briefing room, President Obama acknowledged that the investigation into today's bombings in Boston was ongoing, but assured Americans that "we will find out who did this, and we will hold them accountable." Also noting that today is the city's Patriot's Day holiday, and paying tribute to the city's "tough" spirit, he said, "Make no mistake. We will get to the bottom of this. We will find out who did this and why they did this." He did not use the words "terror" or "terrorism."

UPDATED 5:30 p.m. EDT: According to a White House official, this afternoon President Obama received briefings from FBI Director Robert Mueller and Department of Homeland Security Secretary Janet Napolitano on "the active investigation and response to the incident in Boston, including the ongoing coordination with state and local officials." In addition, the president called Boston Mayor Tom Menino and Massachusetts Gov. Deval Patrick "to express his concern for those who were injured and to make clear that his administration is ready to provide needed support as they respond to the incident."

UPDATED 4:15 p.m. EST: Boston police have confirmed that two people have died and 23 were injured, Reuters reports.