Boston bombing suspect 'serious but stable'

Dzhokhar Tsarnaev was rushed to hospital where he remains in a serious condition. Photo: APTN

The surviving suspect in the Boston Marathon remains in a serious condition in hospital this evening as the news of his capture spread across the city and prompted spontaneous displays of patriotic celebration.

19-year-old Dzhokar Tsarnaev is reported to be in a serious but stable condition, under heavy guard.

He was pulled, wounded and bloody from a boat parked in the backyard of a home in Watertown, Massachusets.

Read: Boston Marathon bomb suspect Dzhokhar Tsarnaev captured

Massachusetts Governor Deval Patrick, speaking this afternoon said Tsarnaev is likely "not able to communicate yet."

President Barack Obama said there are many unanswered questions about the Boston bombings, including whether the Tsarnaev brothers - ethnic Chechens from southern Russia who had been in the US for about a decade and lived in the Boston area - had help from others.

More: Obama suspect capture is end of a chapter in this tragedy

Dzhokhar Tsarnaev's capture touched off raucous celebrations in and around Boston, with chants of "USA! USA!" residents flooded the streets in relief four days after the twin explosions ripped through the marathon crowd at the finish line, killing three people and wounding more than 180.

Washington Correspondent Robert Moore reports on the jubilant scenes from Boston.

More: Police hail 'victory' as Boston bomb suspect captured