Independence Day Celebration Was Boston Bombers' Original Target

The brothers believed responsible for the bloody Boston Marathon bombings originally planned a suicide attack on the city's massive Independence Day celebration, surviving bombing suspect Dzhokhar Tsarnaev told investigators, a U.S. law enforcement official regularly briefed on the investigation told CNN.

The Fourth of July party draws about 500,000 people and is televised nationally on CBS.

Dzhokhar Tsarnaev told investigators that he and his brother, Tamerlan, chose the Boston Marathon only a day or two before the event, according to the official.

They changed their plans because their bombs were ready sooner than they expected, the official said. Those bombs were built in the small apartment that suspect Tamerlan Tsarnaev shared with his wife and child, Dzhokhar Tsarnaev told investigators, according to the law enforcement official.

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