Investigators in Washington and Boston denied Wednesday that an arrest had been made in the bombing of the Boston Marathon. They had earlier said there was "substantial" progress in the case.
CNN's John King had said a "dark-skinned male" has been identified in connection with the Boston Marathon bombings, although investigators have yet to publicly confirm the development. King said that videos and photos taken at the scene helped identify the suspect.
The potential breakthrough came from an analysis of a video from the Lord and Taylor department store near the site of the second blast with video from a Boston TV station, CNN's Fran Townsend reported.
The second video is said to have offered a "very clear" facial image of the suspect.
A federal law enforcement source told Townsend that someone was arrested, but later on Tuesday, two senior administration officials and another federal official told her that there had been a misunderstanding among officials and that no one has been arrested, news reports said.
A press conference with Boston's law enforcement on Wednesday is expected at 5 p.m.
Authorities received 2,000 tips from around the world, the special agent in charge of the FBI's Boston Office Richard DesLauriers said.
"Someone knows who did this," DesLauriers declared Tuesday.
The blasts have killed three people: Martin Richard, an 8-year-old boy, Krytle Campbell, a 29 year-old, and Lingzi Lu, a 23-year-old Boston University graduate student.
The explosions have wounded at least 183 people. 100 have been released from a CNN tally reported.
The two bombs hit within 12 seconds apart, and one of the bombs was housed in a pressure cooker inside a backpack, as a lid was found on a roof near the scene of the blast, the FBI said.
The second bomb was also in a metal container, but has yet been proven if it also was in a pressure cooker, the FBI said.
