George Venizelos, head of the FBI's New York office, said the arrest was the latest in an FBI probe that has resulted in more than 70 arrests.

WSJ: SAC Capital portfolio manager arrested in NYC

After the hearing, the head of the FBI's Boston office, Richard DesLauriers, issued a statement describing the FBI and Boston police department's work together on a joint-terrorism task force, where police detectives had access to a database with the details of the FBI's inquiry into Mr. Tsarnaev.

WSJ: Boston Hearing Delves Into FBI Alerts

The head of the Boston FBI office, Richard DesLauriers, said the agency's joint terrorism task force would take the lead on the investigation, and federal agents were already traveling to the area.

WSJ: FBI Uses 'Tripwires' to Catch Bomb Makers

The letters allow the FBI to get data on phone, financial and electronic records without the approval of a judge or grand jury, as long as the head of an FBI field office certifies that the records would be relevant to a counterterrorism investigation.

WSJ: Judge Strikes Down Secretive Surveillance Law

At a press conference later in the evening, Richard Deslauriers, head of the Boston office of the FBI, said that his agency had taken over the investigation.

FORBES: This post was last updated on Monday, April 15 at 11 PM ET.

Shawn Henry, president of Crowdstrike and former Executive Assistant Director of the FBI and head of its Cyber Division, is quick to note that his company does not advocate hacking into systems.

FORBES: Caution: Active Response to Cyber Attacks Has High Risk

Cisneros told the White House and FBI about the affair and payments when he was nominated to head the Department of Housing and Urban Development in 1992.

CNN: Ted Barrett/

In one of the now infamous photos the FBI released to the public in hopes of tips, the older brother has his head down, the visor pulled low over his face as if he's trying to hide.

NPR: For Bombing Suspects, Question May Be Who Led Whom

Burton wants a 100-page report from Charles LaBella, the outgoing head of the Justice Department campaign finance task force, and a memo from FBI Director Louis Freeh, which say there should be an independent counsel campaign finance investigation.

CNN: Burton Subpoenas Internal Justice Memos

FBI, to head its new accountancy-oversight board, intended to restore the faith of investors in the probity of America's company accounts.

ECONOMIST: A loss of confidence