The suspects in the Boston Marathon bombing originally planned to target a July 4 celebration, but chose the prestigious race as a "target of opportunity" after the bombs came together more quickly than expected, sources tell Fox News.
Tamerlan Tsarnaev, 26, and 19-year-old Dzhokhar Tsarnaev allegedly assembled at least four types of improvised explosive devices in the home Tamerlan shared with wife Katherine Russell, sources tell Fox News. Typically, in cases of homegrown terror, only one type of explosive is constructed.
Additionally, Dzhokhar Tsarnaev told investigators the building of the bombs happened more quickly than expected, according to sources. The brothers reportedly had planned to set off the explosives on July 4, but changed their plans when the bombs were finished early.
After the Boston bombings, the brothers still had a pressure-cooker explosive and four pipe bombs and were bound for New York City before they were stopped by authorities, New York officials say. Tamerlan Tsarnaev was killed after a shootout with police days after the Boston attack. Dzhokhar was captured alive but wounded and now is in federal custody facing a charge of use of a weapon of mass destruction that could get him the death penalty.
Sources say the planning for the April 15 attack showed "clear premeditation," including the decision to target the finish line of the Boston Marathon. Three people died in the attack, and more than 200 people were wounded.
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