"Substantial progress" is reportedly being made into the investigation into the explosions that rocked the finish line of the Boston Marathon on Monday and a suspect may have been identified.

CNN reports that video from a nearby Lord & Taylor department store and a  television station was helpful in identifying a "dark skinned male" as a possible suspect.

The FBI has scheduled its next briefing at 5:00pm.

Recovery Of A Lid

Piece of the pressure cooker used as part of bomb in Boston Marathon explosions (FBI)

Investigators earlier 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 according to the Associated Press.

WCVB TV reports that the pressure cooker is made by Fagor brand and the FBI is talking to the company's New England distributor.

A bag next to a mailbox housing one of the Boston Marathon bombs (WHDH TV)

This could be key to tracking down those responsible for the explosions. Unnamed law enforcement tells ABC News that they will track down where the pressure cooker, nails and nylon bag were purchased. Similar work in the Oklahoma City bombing in 1995 tracking down an axle from the bomb truck were eventually traced to Timothy McVeigh.

A person close to the investigation previously told AP the bombs consisted of explosives put in 1.6-gallon pressure cookers, one with shards of metal and ball bearings, the other with nails.

Vigils In Boston

A vigil in Dorchester for Martin Richard (Boston Police)

More than 1,000 came to Garvey Park in Boston's Ashmont section to remember 8-year-old Martin Richard who died moments after hugging his dad when he cross the finished the race.

"What once seemed to be something we watched in the distance or on television has come all too close to home," the Rev. John Connolly of St. Brendan Catholic Church told the gathered crowd according to the Huffington Post. "Upon this field, the feet of young Martin often trode. We are saddened and shattered by the fact that he will not longer run and smile and jump and play and live and love among us. Nothing we can say, and nothing we can do, is adequate in the face of the enormity of that sadness."

The “Peace, Here and Everywhere" vigil took place on Boston Common according to the Boston Globe. As heavily armed National Guardsmen stood nearby, decorated banners with sayings such as “We are Boston strong" flapped in the wind and the  and  the Emerson College a cappella group sang The Beatles’ “Let It Be.”

Another Victim Identified

After the third inning, Sweet Caroline by Neil Diamond was played in honor of the Boston Marathon bombing (Elsa/Getty Images)

The third victim in the blast was identified by the Shenyang Evening  News said as Lu Lingzi, a graduate student at Boston University. An editor at the newspaper said that Lu's father confirmed his daughter's death when reporters visited the family home. The editor declined to give his name because he was not authorized to speak to foreign media. BU officials would not release her name yesterday pending permission from her family.

Fans during Tuesday night's Yankees game put aside their rivalry with the Boston Red Sox and sang Fenway Park favorite Sweet Caroline in support.

"Everybody in New York knows what they're going through," said Mike Petti, 48, a Yankees fan nicknamed Yankee Mike who for 13 seasons has been a staple of the bleacher section where the most hardcore fans — those who hate Red Sox Nation the most — dwell. "When it happened here, Boston was singing 'New York, New York.'"

More About The Bomb

Piece of the pressure cooker used as part of bomb in Boston Marathon explosions (FBI)

Scores of victims of the Boston bombing remained in hospitals, many with grievous injuries. Doctors who treated the wounded corroborated reports that the bombs were packed with shrapnel intended to cause mayhem. A 9-year-old girl and 10-year-old boy were among 17 victims listed in critical condition.


Photos  of the bomb and the nylon bag it was brought in were released as the FBI and Boston Police urged people to keep their pictures and videos coming. Richard DesLauriers, FBI agent in charge in Boston, said the range of suspects and motives was "wide open." People were asked to come forward with video or photos from the marathon or anything suspicious they might have witnessed, such as hearing someone express an interest in explosives or a desire to attack the marathon, or seeing someone carrying a dark heavy bag at the race.

Governor Chris Christie has ordered flags to fly at half-staff in New Jersey on Thursday in honor of the victims of the bombing.

The Associated Press contributed to this story