The area around the marathon finish remains shut down as an active crime scene and will likely stay that way throughout the day on Tuesday. (The map above shows the cordoned off area.) Dozens of bags were left scattered around the area, dropped by fleeing spectators, and police say that each one must be inspected before being removed from the scene.
On Tuesday morning, several top officials, led by Massachusetts Governor Deval Patrick led a news conference about the investigation, but offered very little in the way of new information. Gov. Patrick confirmed that "two and only two" explosive devices were found and any reports of other devices were not true. Also, there are no suspects in custody at this time.
The FBI also confirmed that were no threats made before the Marathon and no imminent threats since that time. The agent in charge did not comment on other aspects of the case, including details about the bombs themselves or how they were made and detonated.
Many other high-ranking officials spoke at the briefing and most asked the public to continue to send tips, including photographs and videos that might aid in the investigation. Investigators are obviously hoping that someone might have caught the bomber on tape in a way that they could be identified. Police Commissioner Ed Davis confirmed that there were 176 confirmed casualties that presented at local hospitals, and three deaths.
Beyond that, not much was offered other than encouragement, support, and vows to find the bomber or bombers and bring them to justice. Here are some other quotes from the briefing:
Mayor Tom Menino: "Yesterday, terror was brought to the city of Boston.... Boston is a strong city. The city will get through this."
Mass. Senator Elizabeth Warren: "The president is actively involved."
Rick Deslauriers, FBI Special Agent in Charge: "Our mission is clear: To bring to justice those responsible for the marathon bombing... Expect to see agents conducting the investigation throughout the Boston area. There are no known additional threats." He later added, "We will go to the end of the earth" in a "worldwide investigation."
Gene Marquez, ATF: "We have 30 forensic specialists en route or on scene." Rumors of as many as seven unexploded devices were not true. If you have photos or video, please contact authorities. "Crime scene will take several days to process."
Carmen Ortiz, U.S. Attorney: "This is an active and ongoing investigation."
Ed Davis, Boston Police Commissioner: "Units from New York and Baltimore" are helping. He says that securing all video in the area is "basic investigative protocol." He asked the public to submit photos, and to note the time they were taken.