Boston bombs: a city in the grip of terror Boston's stations and subways were closed, while airspace was restricted and controlled explosions were carried out on several suspicious packages. Streets were deserted as a city of around a million people was left effectively under siege. John Kerry, the US Secretary of State, promised that authorities would win a "direct confrontation with evil" by bringing justice to the Tsarnaevs, whose attack at the finish line injured 174 spectators and runners. "We're part of the way there, and the president intends to finish the job," Mr Kerry said. The dramatic scenes unfolded as it emerged that America's worst terrorist attack since September 11, 2001, had been carried out by young brothers who had been brought up in America by their parents. They appeared to have hatched their plot in a flat in Cambridge, Masachussets, the home of Harvard University, a decade after arriving in the US from the Russian province of Dagestan, on the border with Chechnya. Dzhokhar, a University of Massachusetts student, was tonight being hunted across the region, with officers focusing on the suburb of Watertown, nine miles from the bombings. Relations suggested that he had been led into jihadism by Tamerlan, a boxer and devout Muslim, who had publicly denounced Americans for having no "values" or "control." Hundreds of investigators were going door-to-door in Watertown to find the 19-year-old, who was feared to be wearing a suicide vest after a trigger was discovered on his brother's body. Teams of officers from the FBI, city police and state police swarmed the town of 30,000 people, several of whom posted photographs of snipers and troops perched on their garden sheds. They were joined by SWAT teams, explosive experts and police dog handlers as federal and state authorities sought desperately to prevent any further violence following Dzhokhar's escape. Ruslan Tsarni, the bombers' uncle, said his nephews had "put a shame on the family and a shame on the entire Chechen ethnicity" by carrying out their lethal attack. "Dzhokhar, if you're alive, turn yourself in and ask for forgiveness," Mr Tsarni added at his home in Maryland. Condemning jihadism, he said: "I love this country, which gives a chance to everybody." The brothers' father refused to accept the official account. Anzor Tsarnaev described Dzhokhar as a "true angel" and "an intelligent boy" who was studying medicine. "They were set up, they were set up!" he exclaimed. Postings on a Twitter account reportedly belonging to the 19-year-old appeared to vaguely foreshadow Monday's attack. "I'm no golden boy but maybe, just maybe we should be expecting something soon," said one post on the account, which was in the name of Jahar, a nickname said by friends to be used by Dzhokhar. Last year the Twitter account also stated that the account also stated that the"Boston marathon isn't a good place to smoke." Hours after the bomb attack, a tweet from the account said: "Ain't no love in the heart of the city, stay safe people." The brothers were tracked down just hours after the FBI released images of them carrying backpacks that were recorded by surveillance cameras along the marathon route. With Dzhokhar still known publicly only as "white cap" and Tamerlan as "black cap," gunfire at 10.30pm at the Massachusetts Institute of Technology, in Cambridge, soon turned out to be connected. The brothers shot dead a university policeman, before fleeing, carjacking a vehicle and taking its driver hostage. Later, at a petrol station, they freed the driver, who promptly alerted authorities. Pursued by police, the attackers began throwing bombs and shooting at the officers, wounding one. Police fired back and killed Tamerlan, whom Dzhokhar was forced to drive over to escape. US intelligence agencies were tonight urgently looking into whether the brothers had received training or assistance from overseas extremists, after it emerged that Tamerlan had left the US and travelled via Russia last year.