A US prosecutor told a jury that a friend of Boston marathon bombing suspect Dzhokhar Tsarnaev had lied repeatedly to the FBI during the investigation into the deadly attack.

A college friend of alleged Boston Marathon bomber Dzhokhar Tsarnaev has pleaded guilty to removing evidence of the deadly 2013 attack.

Boston marathon bombing suspect Dzhokhar Tsarnaev told a friend a month before the attack that he knew how to make a bomb, a US prosecutor told jurors at the friend's obstruction trial.

Tens of thousands of runners, cheered by a multitude of spectators, set off through the streets of Boston on Monday to reclaim the world’s oldest marathon from the fear left by last year’s deadly twin bombing.

It was a shocking slaying in a Boston suburb that sometimes goes years without one homicide, let alone three at once. The victims' throats had been sliced in a home on a tree-lined street, marijuana and cash strewn over their bodies.

Investigators have concluded an FBI agent should be cleared of wrongdoing over the fatal shooting of a Chechen immigrant while he was being questioned about his ties to one of the Boston Marathon bombing suspects, a US law enforcement official said.

An FBI agent overheard Boston Marathon bombing suspect Dzhokhar Tsarnaev make a "statement to his detriment" when his sister visited him in prison, US prosecutors said. Prosecutors did not reveal what Tsarnaev said, but they objected to what they called an attempt by Tsarnaev's lawyers to suppress the statement.

Rolling Stone defended on Wednesday a cover story on Boston bombing suspect Dzhokhar Tsarnaev, which triggered angry claims that it was “glamorising terrorism” and calls to boycott the US magazine.

The family of a Chinese graduate student killed in the Boston Marathon bombing will reportedly receive US$2.2 million compensation, prompting a social media outcry over the lack of comparable assistance for disaster victims on the mainland.

Boston Marathon bombing suspect Dzhokhar Tsarnaev scrawled anti-American messages inside the boat where he lay wounded, according to US federal prosecutors.

Thousands of runners and supporters have taken to the streets of Boston to complete a marathon that many were forced to abandon last month after bombs exploded near the finish line.

There is no denying the worth of social media in keeping us in touch and informed. In careless hands, though, it can cause panic, anguish, pain and suffering. The hacking of a news agency's Twitter account that led to a plunge in US stocks and the wrongful implication of a man in the Boston Marathon bombings put the problem sharply in focus. Users need to think twice about what they read, check where it comes from and be less compulsive about passing it on.

A Chinese entrepreneur has told an American newspaper how Boston Marathon bombing suspect Tamerlan Tsarnaev stopped his car on the night of the deadly shoot-out with police, uttering the words 'Don't be stupid', before carjacking the vehicle.

To follow the drama of the manhunt for the Boston Marathon bombers online through Twitter, Reddit, television news, police scanners and newspaper updates was to be inundated with an abundance of almost real-time information. Anyone with a computer and internet access could get a virtual view of events, blow by blow, and connect the dots, rightly or wrongly, along the way. To follow the tweets of Watertown eyewitnesses, in particular, was to be thrust into a front-row seat of a real-life movie of guns popping in the dark and bodies falling, police cars racing and bystanders mistakenly apprehended.

I write as a former member of the Legislative Council. Throughout the history of Hong Kong, there has never been a level playing field.

Violence that has racked the North Caucasus region for years has spread to the republic of Dagestan and reached its capital, Makhachkala, which can often seem a city under siege. Checkpoints are a common sight, as are patrolling police with body armour and assault rifles.

Freed from a police order to stay in their homes, people from Watertown and further away went to see where marathon bomb suspect Dzhokhar Tsarnaev hid and was caught.

Chechen is not the same as Czech. The Czech Republic is different from Chechnya. That's the simple message that the Czech government wants Americans to know in the aftermath of the bombings in the Boston Marathon, allegedly by two brothers of Chechen origin.

People across the Boston area breathed easier the morning after Dzhokhar Tsarnaev, 19, was pulled, wounded and bloody, from a tarp-covered boat in a Watertown backyard.

A 34-year-old man has been arrested in Singapore over an online threat to bomb several locations in the city state in the aftermath of the Boston Marathon attack, police said yesterday.

Boston remembers its pain. A commitment to rise to the occasion to remember all who suffered and lost their lives in times of strife, is written into the fabric of the city.

Tomorrow's London Marathon will take place amid a climate of heightened security and increased vigilance following the fatal bomb attacks that plunged the Boston Marathon in America into tragedy.

Three Chinese friends from Boston University went to sample American life at the city’s ill-fated marathon. Lu Lingzi was killed, Zhou Danling was badly hurt and the third wonders how she survived unscathed.

Two letters suspected of containing the deadly poison ricin and addressed to US President Barack Obama and a senator were related and bore a postmark from Memphis, Tennessee. The FBI said the Obama letter contained a "granular substance that preliminarily tested positive for ricin" and had been intercepted at a facility outside the White House that screened the president's mail.

A letter addressed to US President Barack Obama suspected of containing the deadly poison ricin was intercepted at a mail-screening facility outside the White House yesterday, as China mourned the death of a mainland graduate student in the Boston Marathon bombing.

The victim was from Shenyang, Liaoning, and a graduate of the Beijing Institute of Technology, reports said. Over the last hours, hundreds of condolence messages have been posted on the reported victim's Sina Weibo microblog.

United States investigators yesterday stepped up their search for the attacker or attackers who devastated the Boston Marathon with two bombs that killed three people and hurt more than 170, many of whom suffered horrific injuries.

The twisted mind of the perpetrator of the attack on Boston's marathon is impossible to fathom. No matter what their grievance or message, who could believe that harming children, fun-runners, athletes and spectators was an accomplishment? Yet the bombs were timed to cause the maximum loss of life, without regard for who was caught in the blasts, all in the name of making a point for which none of us will now ever care. There will never be sympathy for people who commit such acts, no matter how justified they may seem to themselves; there will only be unity against their extreme ways.

A Hong Kong runner in the Boston Marathon has told of the chaotic scenes as rescue workers tore away barriers to get to those injured by the twin blasts. Simeon Jupp, from Hong Lok Yuen, finished the 42-kilomere course and was still near the finishing line when the first bomb went off.

Zhou Danling, a graduate student at Boston University, suffered serious injuries in the blasts which killed three people and left more than 100 injured when they ripped through the crowd at the finish line of the Boston Marathon. 

My first thought was that it might be fireworks or a cannon, but it was instantly clear from the amount of debris in the air that it was either a terrible accident or a bomb. It was a great day – perfect weather and unbelievable crowds supporting the runners.

Security measures at the Boston Marathon were not particularly tight, a Hong Kong runner said on Tuesday after two bombs exploded at the US event, leaving at least three people dead and more than 100 injured.