The brothers suspected of the Boston Marathon bombings originally planned to carry out the attack on July 4 this year, a law enforcement official has said.
But the official claimed the Tsarnaev brothers decided to strike earlier because they completed building their bombs more quickly than expected.
More top news
Warm sunny spells and some showers through rest of today across the UK, particularly in the southeast
A Norwich supporter feared he would miss out on the club's biggest match for years after a barking mad incident
An international manhunt has been launched for a husband and wife wanted in connection with an attempted murder.