A number of Boston bombing "persons of interest" have emerged following Monday's deadly attacks that has left 3 dead and more than 140 injured.
According to some reports, authorities have a number of people of interest; one Saudi Arabian student was reportedly being questioned at a Boston hospital, and another person was being sought who was seen trying to enter a restricted area near the marathon route just 5 minutes before the explosions took place.
The Saudi student was questioned, but is not thought to be a suspect in the bombings.
The two deadly bombings took place about 12 seconds apart about 100 to 150 yards away from one another near the finish line of the marathon route. It has emerged that medical staff were also pulling ball-bearings from some victims, sparking reports that the explosive devices may have contained ball-bearings to maximize the carnage from the blasts.
The large explosions were initially confirmed to have killed two, with more than a dozen in critical condition. However, the death toll was raised to three on Monday evening, with an 8 year old boy said to be one of those who had been killed by one of the blasts.
Authorities and eye witnesses have confirmed that many of the injuries taking place included amputations.
It was also reported later on Monday that as many as three other explosive devices were found near the finish line, however, by Tuesday morning those other "devices" were confirmed by authorities as simply "suspect packages" that have now been determined to be non-explosive.
According to one source to the Boston Globe, police were questioning a "person of interest" who was injured in the blast, at Brigham and Women's Hospital. However, no arrests had been made in the initial enquiries by Monday night.
Various media sources had also reported Monday that law enforcement officials were alerted to search for a "darker skinned or black male" who is thought to have a foreign accent, who may have tried to enter a restricted area near the bombings location just minutes before the blasts took place, according to CNN.
That suspect was reportedly wearing a black backpack and a hooded sweatshirt.
Meanwhile on Monday afternoon, President Barack Obama addressed the nation in connection to the bombings, saying:
"Good afternoon, everybody. Earlier today, I was briefed by my homeland security team on the events in Boston. We're continuing to monitor and respond to the situation as it unfolds. And I've directed the full resources of the federal government to help state and local authorities protect our people, increase security around the United States as necessary, and investigate what happened.
"The American people will say a prayer for Boston tonight. And Michelle and I send our deepest thoughts and prayers to the families of the victims in the wake of this senseless loss.
"We don't yet have all the answers. But we do know that multiple people have been wounded, some gravely, in explosions at the Boston Marathon.
"I've spoken to FBI Director Mueller and Secretary of Homeland Security Napolitano, and they're mobilizing the appropriate resources to investigate and to respond.
"I've updated leaders of Congress in both parties, and we reaffirmed that on days like this there are no Republicans or Democrats — we are Americans, united in concern for our fellow citizens.
"I've also spoken with Governor Patrick and Mayor Menino, and made it clear that they have every single federal resource necessary to care for the victims and counsel the families. And above all, I made clear to them that all Americans stand with the people of Boston.
"Boston police, firefighters, and first responders as well as the National Guard responded heroically, and continue to do so as we speak. It's a reminder that so many Americans serve and sacrifice on our behalf every single day, without regard to their own safety, in dangerous and difficult circumstances. And we salute all those who assisted in responding so quickly and professionally to this tragedy.
"We still do not know who did this or why. And people shouldn't jump to conclusions before we have all the facts. But make no mistake — we will get to the bottom of this. And we will find out who did this; we'll find out why they did this. Any responsible individuals, any responsible groups will feel the full weight of justice.
"Today is a holiday in Massachusetts — Patriots' Day. It's a day that celebrates the free and fiercely independent spirit that this great American city of Boston has reflected from the earliest days of our nation. And it's a day that draws the world to Boston's streets in a spirit of friendly competition. Boston is a tough and resilient town. So are its people. I'm supremely confident that Bostonians will pull together, take care of each other, and move forward as one proud city. And as they do, the American people will be with them every single step of the way.
"You should anticipate that as we get more information, our teams will provide you briefings. We're still in the investigation stage at this point. But I just want to reiterate we will find out who did this and we will hold them accountable."
Here is a video showing some of the photos from today's tragedy in Boston:
Here is a video news report into the bombings: