A message sent to Boston officers on the police scanner, however, said flatly: “Despite reports to the contrary, there has been no arrest.” The message added that officers should “remain diligent in our mission.”
The reports that offiicals were zeroing in on a possible suspect came as several news sources said investigators had identified images of a suspect seen delivering one of the explosive devices near the marathon finish line.
CNN’s John King quoted law enforcement sources as saying that surveillance video from a nearby Lord &Taylor department store was key in the investigation. Television footage also played a role, CNN reports.
“The camera from Lord & Taylor is the best source of video so far,” said Dot Joyce, a spokeswoman for Boston Mayor Thomas M. Menino tells the Boston Globe. “All I know is that they are making progress.”
A law enforcement official, who described the investigation as “very active,” told USA TODAY that authorities have been focusing on a mass of photographic evidence provided by the public and area security cameras. But the source indicated that there mixed views on the value of the analysis so far.
“There is a lot going on,” said the official, who is not authorized to comment publicly on the investigation.
As investigators painstakingly gather fragments of evidence from the two explosions that killed three people and injured more than 170, a lid has been recovered from a pressure cooker apparently used as the explosive device, a federal law enforcement official said.
The official, who has been briefed on the matter but is not authorized to comment publicly, told USA TODAY the lid was found on a roof near the scene of the blast.
The discovery came as the head of the Department of Homeland Security told a Senate panel in Washington that the Coast Guard worked with the Boston Police Department after the bombings Monday to guard against any potential water-borne attack from the harbor or the Charles River.
Janet Napolitano said officials continue to investigate the bombing with the FBI as a solitary act of terror.