Federal officials are denying reports that a suspect is in custody in the Boston Marathon bombings.
A law enforcement official briefed on the investigation says a suspect in the Boston Marathon bombings is about to be arrested.
The official spoke to The Associated Press on condition of anonymity Wednesday. The official was not authorized to divulge details of the investigation.
The official says the suspect is to be taken into custody by federal marshals and taken to a courthouse.
Sources have told CNN's John King that Boston authorities believe they have identified a suspect in the marathon bombings.
According to CNN, videos from a department store and a TV station have lead investigators to a suspect.
The Boston Globe is reporting that authorities have an image of a suspect carrying, and possibly dropping, a black bag at the bombing scene on Boylston Street.
The Globe has also reported that a camera at Lord & Taylor provided clear video of the area, although it's not known whether the image of the suspect was taken from that camera.
The FBI has said it will hold a news conference at 5 p.m.
Earlier today, Federal agents zeroed in on how the Boston Marathon bombing was carried out — with kitchen pressure cookers packed with explosives, nails and other lethal shrapnel — but said they still didn't know who did it and why.
An intelligence bulletin issued to law enforcement and released late Tuesday included a picture of a mangled pressure cooker and a torn black bag the FBI said were part of a bomb.