Boston Marathon bombers' defiant mother rails against Dzhokhar Tsarnaev's guilty verdict in bizarre rant as he faces death penalty

The 21-year-old Tsarnaev (right) was found guilty by a Boston jury this morning of all 30 counts, but his mother, Zubeidat (left), continued asserting his and his late brother's innocence. In a text message (inset) to her sons' supporter Timur Rudaev, Zubeidat Tsraneav called the convicted killer 'my precious boy' before going on a rant against the US. 'America is the real terrorist and everyone knows that... 'my boys are the best of the best,' she wrote in the text, which was later shared on the Russian social media site VKontakte.