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Officials investigating the Boston Marathon bombings say they have found images of a potential suspect from surveillance camera footage, BBC reported. 

Boston City Council President Stephen Murphy, who was briefed by police, said a man was seen dropping off a bag at the scene.

Earlier, the FBI denied widespread reports that a suspect had been arrested.

Three people died in two blasts near the marathon's finish line on Monday.

Dozens more people remain in hospital, many of them seriously injured.

Mr Murphy said detectives had spotted the potential suspect in surveillance footage from a nearby store, AP news agency reported.

He said he didn't know if investigators had identified the man, but added: "They may be on the verge of arresting someone and that's good."

A planned FBI news conference outlining the progress of the investigation was postponed on Wednesday afternoon.

Earlier, police and journalists arrived at a courthouse in Boston amid confusion over whether a suspect had been held in connection with the attacks.

"Contrary to widespread reporting, there have been no arrests made in connection with the Boston marathon attack," the FBI said in a statement.

"Over the past day and a half, there have been a number of press reports based on information from unofficial sources that has been inaccurate."