The FBI searched an apartment of a Saudi citizen and removed items but the person has not been found to be connected to the Boston Marathon Bombings, that killed three and wounded 154 people Monday.
The agency had consent to interview the young Saudi who is visiting on a student visa.
Many others have been questioned including a Saudi citizen whose leg was wounded in the explosion and a Saudi woman doctor, according to CNN. At this moment nothing officials are not dismissing any information as it is unclear whether the attack was foreign or domestic.
Investigators told police Monday to be on the lookout for a "darker-skinned or black male" with a possible foreign accent in connection with the marathon bombs, according to a law enforcement advisory obtained by CNN. The man was seen with a black backpack and sweatshirt and was trying to get into a restricted area about five minutes before the first explosion, the lookout notice states.
The crime scene has been reduced from 15 blocks to 12 and will be narrowed as the investigation proceeds, Davis said Tuesday.
Authorities also plan to search through videos from surveillance cameras near the attack in Boston's Copley Square. So far, no footage has been spotted showing someone placing the bombs, a law enforcement source said.
Tiny clues may help lead to who was behind the terrorist attack that killed three people and wounded 152. Investigators are beginning the painstaking process of piecing through fragments for anything that could indicate the "signature," said a federal law enforcement official who works in the intelligence community.
The bombs were small, and initial tests showed no C-4 or other high-grade explosive material, suggesting the packages used in the attack were crude devices, a federal law enforcement official in the intelligence community said.
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The White House and FBI have called the explosions in Boston a terrorist attack and cities across the globe have heightened security.
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(Photo: John Blanding/The Boston Globe via Getty Images)