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.