Dzhokhar Tsarnaev and his brother Tamerlan had been in the US for a decade before setting on the path that would see them carry out what many described as the deadliest act of terrorism on American soil since the attacks of September 11, 2001.
Ethnic Chechens, the brothers came to Massachusetts with their family, fleeing violence at home and hoping for a better life. They settled in the college town of Cambridge and Dzhokhar, then aged just eight, appeared to fit it.
