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U.S. Armed Forces

Ambulances are seen near the finish line of the Boston Marathon where there were two explosions on Monday, April 15, 2013. (credit: CBS News)

Expert: Long Investigation Likely Needed To Get To Bottom Of Boston Explosions

In the wake of the explosions at the Boston Marathon Monday afternoon, police are looking at all possible angles — whether it was an act of domestic terrorism or international terrorism.

04/15/2013