'CAPTURED!!!' Boston police announce Marathon bombing suspect in custody

The second suspect in the Boston Marathon bombings was taken into custody Friday night, bringing to an end a massive manhunt in the tense Massachusetts capital worried by warnings the man was possibly armed with explosives.

After announcing the arrest on Twitter, Boston police tweeted: "CAPTURED!!! The hunt is over. The search is done. The terror is over. And justice has won. Suspect in custody."

Authorities confirmed the man in custody is 19-year-old Dzhokar Tsarnaev, who escaped an overnight shootout with police that left his older brother Tamerlan Tsarnaev -- the other man wanted in the bombings -- dead.

The younger Tsarnaev was in serious condition, Boston Police Commissioner Ed Davis said at a news conference. He was being treated at Boston's Beth Israel Deaconess Medical Center, hospital spokeswoman Kelly Lawman said.

Tsarnaev was cornered late Friday as he was hiding on a boat in a backyard of Watertown, a suburb of Boston.

Police were alerted to his whereabouts by a man who went outside after authorities lifted an order for residents to stay inside during the manhunt. The resident saw blood on a boat in the backyard, Davis said. He then lifted up the tarp covering the boat and "saw a man covered with blood," he said.

It was that call that resulted in an arrest less than a week after two bombs exploded near the finish line of the Boston Marathon, shocking the nation and leaving a city on edge.

"There was an exchange of gunfire, and I don't know if he was struck," Davis said of the suspect.

Authorities, using a bullhorn, had called on the suspect to surrender: "Come out with your hands up."

Tsarnaev, according to authorities, refused to surrender.

"We used a robot to pull the tarp off the boat," David Procopio of the Massachusetts State Police said. "We were also watching him with a thermal imaging camera in our helicopter. He was weakened by blood loss -- injured last night most likely,"

Tsarnaev was taken into custody after authorities rushed the boat, Davis said.

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