US officials are denying that a suspect is in custody in connection with the deadly Boston Marathon bombings.
A law enforcement official briefed on the investigation told The Associated Press a suspect was in custody.
But the FBI and the US attorney's office in Boston dispute that.
The official who spoke to The Associated Press did so on condition of anonymity and stood by the information even after it was disputed.
The official had said the suspect was expected in US federal court in Boston.
Reporters and police have converged at the courthouse.