Dzhokhar Tsarnaev, suspected to be behind the twin blasts at the Boston Marathon on Monday was arrested after an exchange of gunfire with the police in which his 26-year-old accomplice brother was killed.
He was captured from a boat, where he was hiding, authorities announced.
Dzhokhar, who was bleeding, was taken to a hospital and was in serious condition, the police said.
"Captured!!! The hunt is over. The search is done. The terror is over. And justice has won. Suspect in custody," Boston police department said on Twitter after Dzhokar was arrested.
His capture ended an unprecedented day-long siege of Greater Boston, after a frantic night of violence that left one Massachusetts Institute of Technology (MIT) police officer dead, an MBTA Transit Police officer wounded, and an embattled public - rattled by the touch of terrorism - locked inside homes.
The arrest also ended a five-day long drama after twin bombs, inside pressure cookers, went off in quick succession amidst thousands of people near the finish line of the Boston Marathon, killing three people and injuring more than 180 others.
Dzhokhar was injured when the police shot dead his brother. Dzhokhar had managed to escape from the scene.
