The FBI held a possible suspect in custody on Wednesday for the twin explosions that occurred at the Boston Marathon on Monday.

Watch the Boston Interfaith Memorial service for victims of the Boston Marathon bombings LIVE HERE.

The FBI have an as-yet-identified male in question who is described as "dark skinned man who was wearing a backwards cap" thanks to security cameras that captured him "planting the second explosive" and amateur pictures taken by someone in the public.

The Boston Police Department said so far, the man has been taken into custody but has not been arrested, according to Associated Press.

FBI announced that they obtained video footage from a nearby Lord & Taylor department store which shows the male suspect placing the second bomb that was placed 550 feet away from the first and went off by the finish line of the annual race. The surveillance tape showed the man walking to the crime scene he created while talking on a cell phone, putting a package in a black bag and then placing it at the second explosion location and then quickly walking away.

The amateur photos were taken by Benjamin Thorndike who was in an office building nearby and watching the marathon from the office windows and sent to Boston's 7 News.

"I went to the window and I was looking in the direction of the finish line. I saw simultaneously a runner go down, a huge explosion, and then a deafening roar," Thorndike told Mail Online. "I had my camera in my hand, and I just pushed the rapid-shutter button down and just took 25 pictures over the course of what felt like a long time, but I think it was only 15 or 20 seconds."

Mail Online published Thorndike's pictures that were taken from the same angle as Lord & Taylor. In the first, a grey and orange package, believed to be the first bomb, is placed on a sidewalk next to a green mailbox in front of barricades places in front of the crowd. The subsequent photo of the same angle shows the sidewalk without the package next to the mailbox. The photo is blurred of several people that are injured from the blast.

The pictures he took showed a man wearing all black clothing running in the opposite direction of the crowd when the first explosion went off near the finish line. His pants are shredded and in the two images he looks to his left and right as he flees the crime scene.

View Thorndike's amateur photos of the Boston Marathon bomb suspect here

The twin bomb explosions took the lives of three people, left more than 180 people injured and many without limbs. Many people had to be amputated due to severe injuries from the blast.

President Obama addressed the nation during a live televised press conference three hours after the explosions on Monday.

"We will find out who did this; we'll find out why they did this," said the president from the White House. "Any responsible individuals, any respon­sible groups will feel the full weight of justice."

"Any event with multiple explo­sive devices, as this ­appears to be, is clearly an act of terror, and will be ­approached as an act of terror," a White House official said. "We don't yet know who carried out this attack, and a thorough inves­tigation will have to determine whether it was planned and carried out by a terrorist group, foreign or domestic."

The Boston Marathon bombing is even more disheartening because this year's fete was dedicated to the victims of the Sandy Hook school shooting. Several family members of the victims in the shooting were sitting in the VIP section near the finish line where the first explosion went off, according to reports.