The president of the Boston City Council says that a surveillance video shows someone believed to be a suspect in Monday's Boston Marathon bombings, which left three people dead and more than 170 others injured.
Federal authorities have neither confirmed nor denied reports that the FBI obtained video of a man carrying a backpack or duffel bag after the first explosion and placed it before the second explosion, but Stephen Murphy, the president of the Boston City Council, did confirm those reports.
"A suspect is seen dropping a bag near the point of the second explosion and heading off, and there's been a confirmation of a description of someone leaving the scene," Murphy said.
Murphy said he was briefed by Boston police.
He said he was encouraged that a department store on Boylston Street did have the video of what he called a suspect.
"It's very active and very fluid right now, that they're on the chase," Murphy said. "They may be on the verge of arresting someone, and that's good, because the longer time that goes by, the less likely there is an arrest. It gets cold, and you lose your leads and stuff like that."
Reports that an arrest has been made in connection with the bombings have all been denied by the Federal Bureau of Investigation, U.S. Attorney's office and the Boston Police Department.
Still, the report led to confusion at a federal courthouse in Boston, where hundreds of people gathered in anticipation of a suspect.
Later, there was a bomb scare in the building, which led to an evacuation of the building.
Ultimately, the bomb scare turned out to be nothing.
There was also confusion when it came to news conferences Wednesday.
The FBI originally had a news conference scheduled for 5 p.m. but postponed it due to the bomb scare at the federal court building.
They then set one for 8 p.m., but that one was canceled.
There is no word of a next briefing scheduled by the FBI as of 9:15 p.m. Wednesday.
Authorities in hazmat suits continued to search the crime scene on several blocks in the city center Wednesday, looking for more fragments from the two explosions.
The FBI, which has been leading the probe, released photos of pieces of the bombs used in the attack earlier Wednesday.
An intelligence bulletin included a picture showing a mangled pressure cooker.
Investigators say two pressure cookers packed with explosives, nails, ball bearings and other shrapnel were stuffed into black duffel bags and left on the ground.
They later exploded about 10 seconds apart.
The Associated Press says that a piece of one of the explosive devices, the lid of a pressure cooker, was found on a rooftop, suggesting that the force of the blast may have sent flying debris far from the sites themselves.
Pieces of the pressure cookers, bags and shrapnel were sent to the FBI lab in Virginia for analysis.
Pressure cookers have been used as explosive devices in Afghanistan, India, Nepal and Pakistan.
Investigators say they have been following thousands of leads.
Among the three killed in the attack was a Chinese graduate student at Boston University.
The Chinese government has not officially released her name, but a newspaper in China identified her as Lu Lingzi from the northeastern city of Shenyang.
The youngest victim, Martin Richard, 8, was watching his father run in the marathon and had just gotten ice cream when the bombs went off.
His mother and sister were also seriously injured.
Outside his family's home in Dorchester, a single candle was left burning and someone wrote the word "peace" in chalk on the sidewalk.
The third victim has been identified as Krystle Campbell, 29, of Medford, Massachusetts.
She had gone to the marathon to see her best friend's boyfriend cross the finish line.
At least a dozen patients remained in critical condition while many others have been released from hospitals.
"My pants got blown apart," said Jarrod Clowery, an injured spectator. "I was very lucky. I'm blessed."
President Barack Obama and First Lady Michelle Obama plan to visit Boston Thursday for an interfaith service for the bombing victims.
The president on Tuesday described the blasts as an act of terrorism, but he said it's too early to tell if a foreign or domestic group was to blame, or if it was the act of one person.
The president ordered flags at the White House lowered to half-staff through Saturday.
Big Apple Remains On High Alert
As the investigation in Boston continues, the New York Road Runners club says all of its events, including November's marathon, will go on as scheduled.
But it's taking a closer look at safety and security following the Boston attack.
CEO Mary Wittenberg says Road Runners and the NYPD held security talks immediately following Monday's explosions.
They discussed the New York City Marathon as well as events like this weekend's Run for the Parks.
Wittenberg says her group is always looking to review its own policies and procedures, and that she's not satisfied until everyone goes home safely.
"We've spent now 12 years running the marathon since 9/11, and safety and security all, again, took another, everything went to another level after that. And so we are always aware of just how important it is to be careful in every way with our venues, and with supporting our runners and our volunteers and spectators," Wittenberg said.
Wittenberg says Sunday's race in Central Park will begin with a moment of silence to honor Boston, and money raised during the event will also be donated aid in the city's recovery.
Police Commissioner Ray Kelly said that some of the alleged terrorists arrested for allegedly plotting against New York City were possibly thinking about using pressure cookers to carry out attacks.
"Now, Faisal Shahzad, the Times Square bomber, did not use, contrary to some reports I read, did not use a pressure cooker, but he had one in a locker. Whether or not he was going to use it at a separate event, unknown to me anyway," Kelly said. "This knowledge is out there. This is not a sophisticated device, but obviously, it's an effective device."
While Mayor Michael Bloomberg has stressed that there are no specific threats to the city, security remains stepped up throughout the five boroughs.
There was an additional police presence at the World Trade Center PATH station Wednesday morning.
Police resources have been deployed to hotels and houses of worship, as well as tourist attractions and the subways.