Video from the explosion at the Boston Marathon

By Casey Killian
By Haley Burton

April 16, 2013 Updated Apr 16, 2013 at 10:59 AM EDT

Boston, MA (WBNG Binghamton) CBS' WBZ reports at least three are dead, including an 8-year-old boy, and more than 175 people are injured after at the Boston Marathon.

Law enforcement officials and the FBI searched an apartment building outside of Boston late Monday through early Tuesday.

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On Monday afternoon, two bombs exploded within seconds of each other near the finish lane of the Boston Marathon.

A White House official tells CBS News, the FBI is treating the explosions as a terrorist attack.