FBI Says “Currently No Clear Suspects” ; Reportedly Four Improvised Devices; National Guard Now on the Streets of Boston; Officials May Have Had Prior Knowledge; (Videos/Pics)

Updated 04-16-13 13:54 CST

‘The explosives used in the deadly Boston Marathon bombing were contained in 6-liter pressure cookers and hidden in black duffel bags on the ground, a person briefed on the investigation told The Associated Press on Tuesday.

One of the explosives contained shards of metal and ball bearings, and another contained nails, the person said.’ (source)

Updated 04-16-13 9:10CST:

FBI says “currently no clear suspects” in bombing (link)

Bill Hemmer of Fox News reported this morning: Revere, Mass. apartment search yielded no evidence of involvement in bomb plot; Saudi national cleared of wrong doing (no web-based source link available)

Anti-terrorism forces deployed worldwide in the aftermath of the bombing (link)

Still unclear: How many devices were there? Two detonated… two additional unexploded bombs found? (link)

Updated 04-15-13 22:30CST:

National Guard Deployed on Streets of Boston…

…460 Guard members providing security (link)

 Staging area:

Staging area video:

Military personnel and law enforcement tactical teams prepare to shut down 12 block area surrounding bombing (source):

(click to view larger image)

…Police, DHS, FBI, ATF Reportedly serving search warrants in Revere, Mass… (link)

…Report that police have detonated a third device in Boston… video:

RAW FOOTAGE *Warning Graphic Content*:

The National Guard is now on the streets of Boston… Staging area video…

Homeland Security Cmte. Member claims it was a coordinated attack.

CNN Analyst Speculates ‘Right-Wing Extremists’ Could Be Behind Marathon Bombing – see video.

A woman holding several bags was telling runners Saturday (April 13) that they were going to die – read more.

UM Coach gives eye-witness report of bomb-sniffing dogs, told “just a drill” :

University of Mobile’s Cross Country Coach, who was near the finish line of the Boston Marathon when a series of explosions went off, said he thought it was odd there were bomb sniffing dogs at the start and finish lines.“They kept making announcements on the loud speaker that it was just a drill and there was nothing to worry about,” Coach Ali Stevenson told Local 15. “It seemed like there was some sort of threat, but they kept telling us it was just a drill.”

Report: No suspect in custody… (link)

CNN’s Wolf Blitzer Suggests Tax Protesters / Patriots Day May be to blame. VIDEO: http://www.youtube.com/watch?v=yJXo2UnMt14 

Boston PD Immediately Shut Down Cell Phone Network city-wide (link)

OFFICIALS MAY HAVE HAD PRIOR KNOWLEDGE:

A startling report from Paul Joseph Watson has revealed that officials may have had prior knowledge of an impending terror attack.

An eyewitness to the two explosions at the Boston Marathon today said that a “drill” was repeatedly announced before the bombs exploded and that he “thought it was odd” bomb sniffing dogs were in place before the blast.

University of Mobile’s Cross Country Coach Ali Stevenson told Local 15 News, ““They kept making announcements on the loud speaker that it was just a drill and there was nothing to worry about. “It seemed like there was some sort of threat, but they kept telling us it was just a drill.”

The news station also reports that Stevenson “thought it was odd there were bomb sniffing dogs at the start and finish lines.”

Stevenson then describes hearing the explosions as he ran away from the scene, having just completed the marathon.

If this report is accurate, it clearly suggests there could have been some degree of prior knowledge of the bombing, which killed two people and injured at least 23.

ORIGINAL REPORT:

Multiple explosions have rocked the Boston Marathon, causing at least two deaths and tearing apart numerous limbs.

A third explosion is now being reported at JFK Library with officials searching the city for any other previously placed bombs.

A report from CBS News documented those that have been confirmed dead:

Two bombs exploded near the finish of the Boston Marathon on Monday, killing two people, injuring 22 others and sending authorities rushing to aid wounded spectators at America’s oldest and most prestigous marathon, race organizers and police said.

One runner, a Rhode Island state police officer, said he saw at least two dozen people with very serious injuries, including missing limbs.

About two hours after the winners crossed the finish line, there was a loud explosion on the north side of Boylston Street, just before the photo bridge that marks the line. Another explosion could be heard a few seconds later.

During a news conference featuring Boston officials, it was confirmed that a third explosion had hit but that information was still trickling in that could confirm that.

The first two explosions occurred during the last mile of the race which had been dedicated to the Newtown victims families.

The last mile of the marathon was dedicated to the victims of the Newtown shooting. Family members were at the race near the finish line but no injuries to those families have been reported.

Fox News has also confirmed that there are reports that a suspect whom suffered shrapnel wounds is being guarded at a local Boston hospital.

Pictures at the scene: Warning Graphic Content

Images via The Atlantic