Lifting days of anxiety for a city and a nation on edge, police captured the surviving Boston Marathon bombing suspect, found bloodied in a backyard boat Friday night less than 24 hours after a wild car chase and gun battle that left his older brother dead and Boston and its suburbs sealed in an extraordinary dragnet.

"We got him," Boston Mayor Tom Menino tweeted. A cheer erupted from a crowd gathered near the scene.

"CAPTURED!!!" police added later. "The hunt is over. The search is done. The terror is over. And justice has won. Suspect in custody."

During a long night of violence Thursday and into Friday, brothers Dzhokhar and Tamerlan Tsarnaev killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a desperate getaway attempt, authorities said.

Late Friday, less than an hour after authorities said the search for Dzhokhar had proved fruitless, they tracked down the 19-year-old college student holed up in the boat, weakened by a gunshot wound after fleeing on foot from the overnight shootout with police that left 200 spent rounds behind.

He was hospitalized in serious condition at Beth Israel Deaconess Medical Center, according to CNN. His brother died at Beth Israel earlier Friday.

Tamerlan Tsarnaev, 26, died in the shootout early in the day. At one point, he was run over by his younger brother in a car as he lay wounded, according to investigators.

The violent endgame unfolded four days after the bombing and just a day after the FBI released surveillance-camera images of two young men suspected of planting the pressure-cooker explosives that ripped through the crowd at the marathon finish line, killing three people and wounding more than 180.