Police net closes and second Boston bomb suspected

Police in Boston have surrounded a building in the suburb of Watertown as they hunt a teenager they suspect was involved in the bomb attack on the city's marathon.

Within the past few minutes media is reporting that shots have been heard in the vicinity of an apartment block which had been cordoned off.

Earlier Tarmelan Tsarnaev (pron: Sar-neye-ev) was killed after a police chase and shootout in the Watertown area this morning.

Its his 19 year old brother Dzokhar (pron: jock-ar) who is still on the run.

His uncle, Ruslan Tsarni (pron: Roos-lahn Sahr-nee) lives near Washington DC.

He says the family thought the boys had a bright future.