Three of the convicted bomber 's family members said they believe Dzhokhar Tsarnaev was the victim of a conspiracy . The FBI has been investigating whether Tamerlan and his younger brother were involved in any terrorist activity before their deaths last week.
Three of the convicted bomber 's family members said they believe Dzhokhar Tsarnaev was the victim of a conspiracy . An uncle said 'American special services ' orchestrated the 2013 terrorist attack which left three dead and hundreds more wounded . Tsarnaev was found guilty by a Boston jury on April 8 of all 30 counts - 17 of them carrying the death penalty . The death penalty phase of his trial begins on April 21 .