Boston Marathon bombing suspects originally planned July 4 attack

Tamerlan Tsarnaev, left, and Dzhokhar Tsarnaev.

Tamerlan Tsarnaev, left, and Dzhokhar Tsarnaev. (Credit: Tamerlan Tsarnaev, left, and Dzhokhar Tsarnaev. )

The brothers suspected of the Boston Marathon bombings had originally planned to carry out the attack on July 4 this year, a law enforcement official said.

But the Tsarnaev brothers decided to strike earlier because they completed building their bombs more quickly than expected, the official said.

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