Officials stand guard near the site of the Boston Marathon explosions, Wednesday, April 17, 2013, in Boston. Authorities investigating the deadly bombings have recovered a piece of circuit board that they believe was part of one of the explosive devices, and also found the lid of a pressure cooker that apparently was catapulted onto the roof of a nearby building, an official said Wednesday. (AP Photo/Julio Cortez)
Officials stand guard near the site of the Boston Marathon explosions, Wednesday, April 17, 2013, in Boston. Authorities investigating the deadly bombings have recovered a piece of circuit board that they believe was part of one of the explosive devices, and also found the lid of a pressure cooker that apparently was catapulted onto the roof of a nearby building, an official said Wednesday. (AP Photo/Julio Cortez)
Military Police, left, inspect the identification card of a man trying to get through a checkpoint near the site of the Boston Marathon explosions, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)
Boston Marathon runner Vu Trang, of San Francisco, cries at a makeshift memorial on Boylston Street near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, in Boston, Wednesday, April 17, 2013. The bombs that blew up seconds apart near the finish line left the streets spattered with blood and glass, and gaping questions of who chose to attack at the Boston Marathon and why. (AP Photo/Charles Krupa)
A makeshift memorial including a pair of running shoes sits on the campus of Boston University after it was learned that BU student Lu Lingzi was one of the victims of the Boston Marathon bombings in Boston Wednesday, April 17, 2013. (AP Photo/Winslow Townson)
Boston University student Joy Liu places a note at a memorial on the campus for Boston Marathon bombing victim Lu Lingzi in Boston Wednesday, April 17, 2013. Lu and two friends had been watching the Boston Marathon near the finish line. (AP Photo/Winslow Townson)
BOSTON (AP) ? In what could be a major break in the Boston Marathon case, investigators are on the hunt for a man seen in a department-store surveillance video dropping off a bag at the site of the bombings, a Boston politician said Wednesday.
Separately, a law enforcement official confirmed that authorities have found an image of a potential suspect but don't know his name.
The development ? less than 48 hours after the attack that left three people dead and more than 170 wounded ? marked a possible turning point in a case that has investigators analyzing photos and videos frame by frame for clues to who carried out the twin bombings and why.
City Council President Stephen Murphy, who said he was briefed by Boston police, said investigators saw the image on surveillance footage they got from a department store near the finish line, and matched the findings with witness descriptions of someone leaving the scene.
"I know it's very active and very fluid right now ? that they are on the chase," Murphy told The Associated Press. He added: "They may be on the verge of arresting someone, and that's good."
The bombs were crudely fashioned from ordinary kitchen pressure cookers packed with explosives, nails and ball bearings, investigators and others close to the case said. Investigators suspect the devices were then hidden in black duffel bags and left on the ground.
As a result, they were looking for images of someone lugging a dark, heavy bag.
One department store video "has confirmed that a suspect is seen dropping a bag near the point of the second explosion and heading off," Murphy said.
A law enforcement official who spoke to AP on condition of anonymity and was not authorized to discuss the case publicly confirmed only that investigators had an image of a potential suspect whose name was not known to them and who had not been questioned.
The turn of events came with Boston in a state of high excitement over conflicting reports of a breakthrough.
A law enforcement official briefed on the investigation told the AP around midday that a suspect was in custody. The official, who was not authorized to divulge details of the investigation and spoke on condition of anonymity, said the suspect was expected in federal court. But the FBI and the U.S. attorney's office in Boston said no arrests had been made.
By nightfall, there was no evidence anyone was in custody. No one was brought to court. The law enforcement official, who had affirmed there was a suspect in custody even after federal officials denied it, was unable to obtain any further information or explanation.
At least 14 patients remained in critical condition. Dozens of patients have been released from hospitals around the Boston area, and officials at three hospitals that treated some of the most seriously injured said they expect all their remaining patients to survive.
On Wednesday, investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues. They picked through trash cans, plastic cup sleeves and discarded sports drink dispensers
Boston remained under a heavy security presence, and some people admitted they were nervous about moving about in public spaces.
Tyler King, a personal trainer from Attleboro who works in Boston, said four of five clients canceled on him a day earlier because they were worried about venturing into the city. He took the train in, but "I kind of kept my head on a swivel."
Kenya Nadry, a website designer, took her 5-year-old nephew to a playground. "There's still some sense of fear, but I feel like Boston's resilient," she said. "The fine men in blue will take care of a lot of it."
Police were stationed on street corners across downtown Boston, while National Guardsmen set up tents on the Boston Common and stationed tactical vehicles.
Dr. Horacio Hojman, associate chief of trauma at Tufts Medical Center, said patients were in surprisingly good spirits when they were brought in.
"Despite what they witnessed, despite what they suffered, despite many of them having life-threatening injuries, their spirits were not broken," he said. "And I think that should probably be the message for all of us ? that this horrible act of terror will not bring us down."
President Barack Obama planned to visit Boston on Thursday to attend a service honoring the victims.
The blasts killed 8-year-old Martin Richard of Boston and 29-year-old Krystle Campbell of Medford, Mass. The Shenyang Evening News, a state-run Chinese newspaper, identified the third victim as Lu Lingzi, a graduate student at Boston University.
___
Associated Press writers Jay Lindsay, Pat Eaton-Robb, Steve LeBlanc, Bridget Murphy and Meghan Barr in Boston; Eileen Sullivan, Julie Pace and Lara Jakes in Washington; and Marilynn Marchione in Milwaukee contributed to this report.
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