FBI: 'No Imminent Threat' After Marathon Bombings

Boston and state police, the FBI and other federal officials said on Tuesday morning that there are no known threats to the public at this time, and that they are continuing to investigate and look for tips and leads related to Monday's bombing at the Boston Marathon.

However, officials would not comment on whether or not anyone has been taken into custody or follow up on any leads relative to the investigation. 

Right now, authorities say their main focus is following up on leads, interviewing witnesses and soliciting tips from the public. 

FBI special agent Richard Deslauriers said "voluminous" tips have been pouring in, including eyewitness accounts, photos and videos of the scene before, during and after the blast.

"Our mission is clear: Bring to justice those who are responsible for the marathon bombing," he said.  "The American public wants answers." 

The two bombs that exploded near the finish line of the Boston Marathon on Monday, injured 176 people—17 critically—and killed three, police said. 

Police also said that residents in the Boston area should expect to see an increased police presence on the MBTA, at Logan Airport and out in the street, both to help facilitate the tip process and to give residents a sense of security.

"The city of Boston should expect to see the FBI conducting investigative activity," said DesLauriers. "We commend the public for the information that has been provided so far and we strongly encourage further assistance."

Anyone with tips or other information can call 1-800-CALL-FBI.