The bomb explosions that took place at the Boston Marathon on Monday killed three people, and their identities were revealed on Tuesday.

The third victim was a graduate student of Boston University and was a student from China.

Boston University has confirmed that one of its graduate students were the third victim to die in the horrific Marathon bombings.

The University released a statement saying: The student was one of three friends who watched the race near the finish line. Another of the three students, also a BU grad student, was injured and is in stable condition at Boston Medical Center.

"Robert Hill, dean of Marsh Chapel, visited the injured student Monday evening and again yesterday afternoon. He reports that she underwent surgery on Monday and on Tuesday. "She is doing well," says Hill. "She has her friends around her, and she will soon have family around her." The third BU student was unharmed.

Twenty-nine-year-old Krystle M. Campbell from Medford, Mass., also died. She was at the race because her boyfriend was running in the marathon. Campbell was at the finish line when the first bomb went off at 2:50 p.m. on Monday.

Photos were released on Tuesday of another victim who died as a result of the explosions: Martin Richard. The 8-year-old died while waiting to greet his father at the Boston Marathon. Richard was with his mother, Denise Martin, and six-year-old sister at the race on Monday. He had stepped off the sidewalk to greet his father Bill Richard- a local community organizer- as he was approaching the tail end of the race.

The first bomb that went of near the finish line just across the VIP section where families of the victims from the Sandy Hook School shooting were standing. The second explosion took off less than 20 seconds later.

More than 140 people were injured as a result of the explosions on Monday. At a press conference held Tuesday, officials confirmed that only two explosives were found and those are the ones that detonated. No unexploded devices were found - contrary to previous reports.

Ed Davis, police commissioner of the City of Boston, said they are working on "the most complex crime scene" ever in the history of their department.

"We will turn over every rock to find who is responsible for this," Davis said Monday night.

Monday's bombing in Boston was the first deadly bombing on U.S. soil since the Sept. 11, 2001 attack. Security has heightened around the country and on Tuesday two flights - one going into Boston's Logan Airport and another departing - were detained for separate security concerns.