Boston Marathon bomber 'adored older brother'

A former brother-in-law of Boston Marathon bomber Dzhokhar Tsarnaev has given evidence from Kazakhstan about the role of a conservative Muslim convert who steered Tsarnaev's older brother towards a stricter version of Islam.

Elmirza Khozhugov, the former husband of Tsarnaev's sister Ailina Tsarnaeva, testified on live video for the defence from the US Embassy in Almaty.