One Boston marathon bombing suspect has been shot dead and another is on the loose, police have said./Breaking News

It follows a shootout in Watertown between the two suspects and dozens of armed officers after a policeman was shot dead at Massachusetts Institute Of Technology, nine miles from Boston city centre.

Boston Police commissioner Ed Davis said: “What we are looking for right now is a suspect consistent with the description of suspect number two – the white-capped individual who was involved in Monday’s bombing of the Boston Marathon.

He is described as light-skinned with brown wavy hair and dressed in a grey hooded top.

The killed suspect was wounded during the gun exchange with the police and was apprehended, police said. He later succumbed to the injuries.

The suspect remaining at large is the FBI’s Suspect 2 in the Boston Marathon bombing, the so-called ‘white hat suspect’. Police called the man a terrorist, who is armed and dangerous.

Unconfirmed reports citing police dispatch say the dead suspect had explosives strapped to his person and that the one on the run may have a similar device.

A 20-block perimeter was established as the manhunt for the second suspect continues. The man is armed and dangerous, police said.

The police did not release the names of the suspects.

Unconfirmed reports citing BPD scanner say the authorities link missing Brown University student Sunil Tripathi with the bombings. He was last seen on March 16 near his apartment close to the university’s campus.

The reports say he was one of the bombings suspects. They identify his alleged partner in the crime as fellow student Mike Mulugeta.

The FBI has released four more pictures of the Marathon bombing suspects, showing their faces from the front.

Jeff Bauman, the Boston Marathon victim whose grisly injury was replicated by photo-hungry news agencies, was the first person to identify a suspected bomber to the FBI.

“He woke up under so much [sic] drugs, asked for a paper and pen and wrote, ‘bag, saw the guy, looked right at me,’” his brother, Chris Bauman, told Bloomberg.

“I’ve had many times with him alone, and yes, he told me every detail.”

Bauman had been standing near the finish line waiting for his girlfriend to complete the Boston Marathon when a man wearing a baseball cap, dark jacket and sunglasses dropped a bag at his feet, according to his brother Chris Bauman.

Less than three minutes later the bag detonated, with the blast mangling both of Bauman’s legs.

While still in intensive care Bauman, 27, spoke with FBI agents and helped in the identification of the possible perpetrators – the same faces that investigators asked the public to help identify during a press conference on Thursday afternoon.

He has survived the attack but both limbs were amputated below the knee. The man Bauman saw with the bag has since been identified as one of the Federal Bureau of Investigation’s two suspects in the bombing that killed three people and injured nearly 200 more.

The New York Times quoted local resident Andrew Kitzenburg, who said he saw the pair, wearing backpacks, shooting at dozens of police officers from behind a black Mercedes SUV.

The 29-year-old said the officers and the men were 70 yards apart and engaged in “constant gunfire”.

He said an explosive device was also thrown at the police and went off some 20 yards from where they were shooting from.

One suspect ran at police and was shot at and apprehended. He later died in hospital.

The other, who is said to be badly injured, managed to get away from the stand-off.

Residents in the area have been told to stay indoors and remain vigilant until further notice, with police conducting door-to-door searches and enquiries.

More follows…

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