Boston bombing: suspect Tamerlan Tsarnaev shot dead, one still at large is named as his brother Dzhokhar A. Tsarnaev

- One suspect killed, one still at large- Man at large named as 19-year-old Dzhokhar A. Tsarnaev- Suspect killed is his brother Tamerlan Tsarnaev, official confirms- Both suspects reported to be from a Russian region near Chechnya- Gunfire and explosions in police chase after car-jacking- Campus police officer responding to a disturbance was shot and killed- Another officer badly hurt in shooting
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Two Chechen brothers were revealed today as suspects in the Boston Marathon bomb attack.

One was killed in a shoot-out with police, who then locked down the city in a hunt for the other.

Hundreds of police officers and FBI agents were engaged in a dramatic race against time to catch the “armed and dangerous” terrorist as the public transport system was shut down and thousands of residents were warned to stay indoors.

The suspected bomber on the run was named as Dzhokhar Tsarnaev, 19, a Chechen refugee living in the Boston suburb of Cambridge.

His brother Tamerlan, 26, identified as his alleged accomplice in the bombings, died this morning after a gun and grenade battle with police.

The brothers are understood to have been living in the US legally for the past five years after fleeing violence in the Russian region near Chechnya.

Dzhokhar Tsanaev is believed to have attended a Cambridge high school and was awarded a scholarship to pursue higher education in 2011.

His father Anzor told the Associated Press today that his son, who is still on the loose, is a smart and accomplished young man.

Speaking from the Russian city of Makhachkala today, Mr Tsanaev said: "My son is a true angel.

"Dzhokhar is a second-year medical student in the U.S. He is such an intelligent boy. We expected him to come on holidays here."

His brother a talented heavyweight boxer, who trained at a local gym, had posted Islamist videos on his YouTube account.

In images released by the authorities, Tamerlan was photographed wearing a black baseball cap at the marathon and carrying a rucksack containing a bomb. His brother was photographed wearing a white baseball cap at the marathon. The drama unfolded after a campus police officer at Massachusetts Institute of Technology in Cambridge was found dead in his car from multiple gunshots at 10.30 last night.

Students at the prestigious university were told not to go outdoors as police officers with dogs swept the campus. A few minutes later, police were called to a violent carjacking of a Mercedes SUV in neighbouring Watertown.

The driver was held hostage for about half an hour before being dumped at a local petrol station.

Police and federal agents traced the vehicle and after a wild car chase exchanged fire with the suspects, who used guns and explosives.

Tamerlan was shot and taken to hospital where he later died. The cause of death was given as multiple gunshot wounds and “extreme blast trauma” thought to have been caused by the explosive he was carrying.

A transit police officer was also critically ill in hospital this morning after being hit in the crossfire.

His brother, who is alleged to have planted the second of the two bombs at the finishing line of Monday’s marathon, escaped.

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The marathon blasts killed eight-year-old Martin Richard, 29-year-old restaurant manager Krystle Campbell and Lu Lingzi, 23, a Boston University graduate student from China. More than 180 were injured in the bombing.

Boston Police Commissioner Edward Davis said of the escaped suspect: “We believe this to be a terrorist. We believe this to be a man who has come here to kill people. We need to get him in custody.” All public transport in Boston was suspended and people waiting at bus stops and subway stations were told to go home.

Police cars, fire engines and ambulances were mobilised as the authorities set up a perimeter and attempted to close the net on the suspected bomber.

A police spokesman said: “He is the Suspect No 2 thought to be responsible for the terrorist bomb attack on the Boston Marathon. He was seen in a video from a 7/11 store last night dressed in a grey hooded sweatshirt.

“He is a light-skinned or Caucasian male with brown curly hair. That’s the white cap individual.

“He should be considered armed and dangerous. We do not have the names at the moment. We are asking for everyone not to leave their homes. We also want to forewarn motorists that they shouldn’t stop for anyone.”

Law enforcement sources said the fear was that the two men had remained in Boston because they were planning another bomb attack. It was thought that a man held earlier by police and forced to strip naked before being apprehended may have been the innocent motorist who was later held captive by the bombers. He was later allowed to walk away free.

Watertown resident Andrew Kitzenberg, 29, said he looked out of his third-floor window to see two slightly built young men wearing jackets engaged in “constant gunfire” with police officers after they were cornered.

A police SUV “drove towards the shooters”, he said, and was shot at until it was severely damaged.

It rolled out of control and crashed into two cars in Mr Kitzenberg’s driveway. He said the two gunmen had a large and unwieldy bomb, which they attempted to throw at police.

“They lit it, still in the middle of the gunfire, and threw it but it went 20 yards at most,” he added. Mr Kitzenberg said the bomb then exploded and one of the men ran toward the police officers. The man was tackled, but it was not clear if he was shot, he said.

Loretta Kehayias, 65, said the explosions “lit up the whole house”. She added: “I screamed. I’ve never seen anything like this.” Mr Kitzenberg said the other man got back into the SUV, turned it toward officers and “put the pedal to the metal”. He added that the car “went right through the cops” and drove off.

Mr Kitzenberg said the two men left “a few backpacks right by the car and there is a bomb robot out there now”. Police screamed at reporters on the scene to turn off phones “if they want to live” as they hunted for the suspects over fears that improvised explosives could be remotely detonated.

The shoot-out — which saw residential lockdowns ordered in other towns west of Boston as well as in Watertown and Cambridge — came hours after the FBI released images and video of the Boston bombing suspects, whom they described as two “armed and extremely dangerous” men.

The images show them walking in single file toward the finishing line of the race about 13 minutes before the twin detonations.

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