As far as I know right now, there were two bombs which made explosion during a marathon in Boston. There have been people killed, and confusion is taking over. It is unknown the nature of this. Anyone has something else?

just the one on yahoo news,,, there is a duplicate entry on the threads

http://www.nytimes.com/2013/04/16/us/explosions-reported-at-site-of-boston-marathon.html?_r=0

At the marathon

There was apparently another bomb that was not detonated yet, so the police did.
http://finance.yahoo.com/news/boston-police-already-calling-marathon-200539581.html;_ylt=A2KJ2PbuYGxRxnEADnrQtDMD

Two people have been killed and 22 inured after two explosions at the finish line of the Boston Marathon, police say.

The blasts shattered the carnival atmosphere of one of the biggest sporting events in the US, causing panic and confusion.

Bloodied victims were initially rushed to a medical tent set up to care for fatigued runners.

Emergency services descended on the scene, which was quickly locked down.

The cause of the explosions has yet to be confirmed.

"There are a lot of people down," one runner was quoted as saying by AP news agency.

The incident reportedly came about three hours after the winners crossed the line.

The Associated Press news agency said there was a loud explosion on the north side of Boylston Street, just before the bridge that marks the finish line. Another loud explosion could be heard a few seconds later, and smoke could be seen rising from the scene of the blasts.

TV helicopter footage showed blood staining the pavement in the shopping and tourist area known as Back Bay.

Mike Mitchell of Vancouver, Canada, a runner who had finished the race, said he was looking back at the finish line when he saw a "massive explosion."

Smoke rose 50ft (15m) in the air, he told Reuters news agency, and people began running away and screaming after hearing the noise. "Everybody freaked out," he said.

Stragglers heading for the finish line were rerouted away from the smoking site of the blasts as the scene was locked down.

The annual Boston Marathon attracting a large field of runners and tens of thousands of spectators.

Meanwhile, police in New York have told the Reuters news agency they have deployed anti-terrorism units at key sites

From the BBC site - http://www.bbc.co.uk/news/world-us-canada-22160691

A marathon to remember one of the first victories of the battle for independence?

What? This is terrible :(

This is very tragic. The motive is still unknown.

Not good. Hope no one else dies.

Is it a holiday in the US?

Kinda worrying for the UK - as we don't yet know who is responsible. The London marathon is on Sunday.

*shakes head*