Conversation so far:
where did the boston bombers live in cambridge
The Tsarnaev brothers lived on Norfolk Street in Cambridge, Massachusetts.
where are the tsarnaev brothers now
Tamerlan Tsarnaev died from gunshots. Dzhokhar Tsarnaev is on death-row at ADX Florence prison.

Question: why did the brothers bomb boston
Self-contained rewrite: why did the tsarnaev brothers bomb boston