Several sources claimed that those responsible for the Boston Marathon bombings had been arrested, but now that information is being contradicted.
According to The Huffington Post, police have footage of a man who they believe may have planted the bombs. However, the suspect has not been identified by name.
The FBI had examined numerous videos, photos and any other evidence gathered before by the witnesses of the bombings.
“The person who did this is someone’s friend, co-worker or relative. Someone knows who did this,” said Rick DesLauriers, head of the FBI’s Boston office.
The undetified individual appeared to be carrying and possibly putting down a bag that may have contained one of the self-made bombs that killed three people and injured hundreds.
The progress in the investigation came as President Obama announced his plans to arrive at Boston to address an inter-faith memorial service.
The U.S. president will tryto comfort a city and to reassure Boston citizens increasingly on edge after the worst terrorist attack in the US since 2001, and also a new poison letter scare in Washington, The Telegraph reports.
Hundreds of people have already come to the Cathedral of the Holy Cross in Boston’s South End, about a mile from the place where explosions occured, before the service, which is scheduled to start at 11 a.m. (1500 GMT).
“President Obama knows how important the city of Boston is to the nation and the world,” said 55-year-old John Snyder, who had joined the line before sunrise. “He is bringing his light to us for much-needed healing.”
“The president being here shows a sign of unity,” agreed Mary Fitzgerald as she waited in line for the memorial service. “It makes me feel like he cares what happens to us.”
Meanwhile, Jay Carney, the White House press secretary, confirmed the reports that President Obama would be accompanied by his wife, Michelle, on his visit to Bostonon Thursday.
The head of the state will give a speech in which his message “will be one of resolve, it will be one of the commonality that we all feel as Americans with the people of Boston and those who were visiting Boston for the marathon,” Mr Carney said.
In her first public remarks on the attacks, Mrs Obama said: “Our thoughts and prayers are with everyone in Boston. What happened on Monday was a reminder that in times of crisis here in America, we respond with courage and grit and selflessness.”
“That’s exactly what we saw from the people of Boston and from all those who rushed to aid the victims, especially the police officers and firefighters, the first responders and our men and women in uniform.”
The president also promised that those responsible for the terror act in Boston on Monday would “feel the full weight of justice”.
“Any responsible individuals, any responsible groups will feel the full weight of justice,” Mr Obama said on Monday.