原文标题：Boston Marathon Explosion: Headquarters On Lockdown Following Blast Near Race Finish Line
Two explosions rocked the Boston Marathon near the finish line, causing multiple casualties and sending the city into chaos. Another explosion occurred at the JFK Library, but authorities were unsure if the incidents were linked.
The blasts downtown in Copley Square occurred just before 3:00 p.m., according to MyFoxBoston.
The number of casualties changed rapidly throughout the afternoon. Two people were killed and twenty-three others were injured, according to a preliminary statement from the Boston Police Department. The number rose to more than 100 injured shortly after 5 p.m., the Boston Globe reported.
The first blast filled a spectator gallery near the finish line with a gray cloud of smoke. Screaming witnesses immediately fled the area. Ten seconds later, a second explosion jolted the crowd.
Streets reserved exclusively for runners filled with emergency crews, as first responders climbed fences to reach wounded athletes and spectators. Flags from nations represented in the race were thrown to the ground
Medical tents set up for runners are being used to treat individuals with injuries.
Police chief Ed Davis said that a third incident took place at the JFK Library in Boston.
"We are not sure if these incidents are related, but we are treating them as if they are," he said.
An unexploded device was also recovered, Davis said.
More than 27,000 runners participated in this year's Marathon, which takes places every year on Patriot's Day, a state holiday in Massachusetts.
Radical Moslems are dancing and celebrating that this has happened in America. No matter who did it, civilized people are never happy when any person dies.
I saw an interview with a retired FBI agent and he said the government is responsible for 90% of domestic terrorism. Think about it.
Thanks again for refusing to secure our sovereign borders Obama. Middle Eastern terrorists and Mexican gang members are flooding over by the thousands.
The truth is we have no idea who did it yet. We have plenty of home born crazys. But, in radical
Anthony Charles Garcia
My God! Please tell me there aren't any serious injuries!
So sad, I hope everyone ends up being ok.
There is a massive amount of blood on the ground. I hope the injuries were not deadly. All are in my thoughts. What a terrible thing to happen during such a wonderful event. I hope this was an accident.
Don't jump to conclusions anyone until more in known. We don't know who or what caused it yet. It's just breaking.
People are assuming muslims did this in the comments. What an absurd idea. We have our own home grown far right extremists in this country, we don't need some other religious faction to show us what true hate or evil is.
This has to be a terrorist attack! HORRIFYING!
Several friends run in this marathon, I am glad they are slow.
It was a mile away from the finish line.
I weep for America
seem like a bomb comes from inside the trash can, according to news.
I just hope that anyone who was injured pulls through, and that whoever did this is found immediately and brought to justice before they have a chance to do it again.
Violence solves nothing.
SOMEBODY IS GONNA PAY FOR THIS.
They happened right as the runners were crossing the finish line and there were no fires. This isn't a generator explosion or pipeline burst. These were explosive devices.
Is this a terrorist attack?
Can we bring our troops now, to protect US?
I'm reliving my teens. Stuff like this happened a lot in the 70's back in London.
Between the tears I pray that this is not real. Not again. Please not again.
Having run 4 marathons myself, 2 of them in in Boston, it's unimaginable for me to see a runner undergoing something like at the finish line....
We can't get in touch with anyone in Boston except through facebook.
Texting is working.
i hope this was an accident.
How could this possibly be an accident?
i was hoping for a gas explosion or electric fire issue, but at this point i see its not.
What a sad day. I will not jump to conclusions like many others are but if it is terrorism I hope we go after those responsible with everything we got.
Such a beautiful city....now scarred.
Reminds me of the bombing at the Atlanta Olympic Games...
It doesn't appear to be a gas line??
If anyone is responsible for this I hope they find them quickly.
No point speculating. Let police and FBI do their work.
Being so close to the finish line (presumably with a lot of people around it), it doesn't sound like it was an accident.
But to those suggesting it was the work of Muslims already without even knowing hardly anything about it, shame on you.
If you have the urge to joke about this tragic event or to somehow politicize it, please refrain. People are injured and it appears people have died. Not the time for humor or politics.