A leading anti-death penalty lawyer who has managed to get life sentences for several high-profile criminals has joined the defence team representing the Boston Marathon bombing suspect.

FBI agents investigating the Boston Marathon bombings have visited the home of dead suspect Tamerlan Tsarnaev's in-laws and carried away several bags.

The very technology that the killer known as the Unabomber railed against during his murderous spree was used to help some of his victims.