As the story starts to turn from the explosions to the investigation, stay with VOA as we . Nearly four hours after the blasts rocked the Boston Marathon, here is what VOA knows:

Two explosions near the finish line killed two people and wounded more than fifty. A third incident took place at the nearby John F. Kennedy library about 90 minutes later, but police are not sure if it is related to the marathon blasts.

Live Updates: Boston Marathon Explosions

President Obama says officals do not yet know who is responsible for the bombings, but that the U.S. will find out who did this and hold them accountable. No person or group has claimed responsiblity for the bombing.

Live Updates: Boston Marathon Explosions

This story is likely to dominate a lot of front pages around the world for several days.

Live Updates: Boston Marathon Explosions

dominates Tuesday's UK front pages - via @

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Scene at BMC. It's calming down.

Flags over @ being lowered to half-staff out of respect for the victims of Boston Marathon tragedy

The London Marathon, which is scheduled to be held on Sunday, April 21, has released the :

Obama said he is directing the full resources of federal government to help state and local authorities to protect our people and increase security around the country.

He added, "We don’t yet have all the answers but we do know multiple people have been wounded, some gravely in the Boston marathon."

He said he has spoken with FBI director Muller and Homeland Security director Naplitano and that they are mobilizing resources to respond. He added that he has updated leaders of congress in both parties.

He said also said Boston police, firefighters and first responders as well as the national guard responded heroically and continue to do so as we speak.

"We still do not know who did this or why and people should not jump to conclusions without all the facts. We will get to the bottom of this. We will find out who did this and why they did this. Any responsible individual and responsible groups will feel the full weight of justice."

President Obama says they do not yet know who is responsible for the bombings, but that the U.S. will find out who did this and hold them accountable.

Watch the president's statement from the White House.

AT&T says it is leaving its WiFi on at the Boston Marathon.

Boston customers may have issues w/wireless voice & data service due to spike in network activity. Our Wi-Fi remains on at .

Interesting, is the digital equivalent of blood donation during crisis -- open up WiFi to help connect loved ones?

Authorities now say two dead and at least 50 injured in the blasts.

Human nature at its best. The list of people offering a place to stay tonight:

President Obama will make an address from the press room at the White House in about 30 minutes. No further details have been released yet.

Boston police say to expect more visible security:

People should expect to see high policevisibility at key locations

And people start seeing more security:

Police w automatic weapons @ Brigham now#wcvb

Just got some numbers from the BAA: 23,326 started the marathon. Of those, 17,584 finished. 4,496 did not.

Google has started a for those looking for people who may have been at the Boston Marathon today.

Times Square right now

The White House has of President Obama on the phone with officials in Boston today.

New from the Boston police:

Update JFK incident appears to be fire related

Statement from Gov on tragedy: There is heightened security @ & on transit

MARATHON EXPLOSIONS: Boston hospitals report more than 100 being treated after Marathon explosions.

Incredible video of the explosions as they happened from Boston.com

Cellphone service shut down in Boston to prevent remote detonations of explosives, official says: -CC

Marathoners picking up their possessions at Bolston & Berkeley.

Police stabilizing situation -checking packages

game vs. Ottawa has been postponed

A third incident at JFK library. Not certain related- but BPD treating like they are

The FAA has imposed a no-fly zone over the site of the Boston Marathon explosions.

RT @: WATCH LIVE: Boston Officials Hold Press Conference On Marathon Explosions via @

Register here to find loved ones. Also - make sure they know you're safe.

The White House says President Obama has called Boston Mayor Tom Menino and Massachusetts Governor Deval Patrick and told them his administration would provide whatever assistance is necessary in the investigation and response.