"This is what you worry about the most, " a source with knowledge of the investigation said.
According to a Western official with knowledge of the investigation, Salehi telephoned Karzai from his jail cell.
He was questioned and returned to his Brooklyn apartment, the source with knowledge of the investigation said.
CNN: After suspension, search for Etan Patz to resume Monday
Sources with knowledge of the investigation have told CNN that the Secret Service agent at the center of the scandal is Arthur Huntington.
Earlier Wednesday, two sources with knowledge of the investigation identified a man as a possible suspect in the attack but did not name him.
CNN: Healing in Boston as investigators seek 2 seen near bombing
That includes any luck in locating Tsarnaev's laptop computer, which a law enforcement official with knowledge of the investigation had said investigators were looking for.
The 100 women in Valle's alleged database live in the United States and overseas, according to a law enforcement source with knowledge of the investigation.
It wasn't clear Monday whether the origin of the bombings was domestic or foreign, according to a federal law enforcement official with knowledge of the investigation.
CNN: FBI to take lead in investigating Boston Marathon bombings
Law enforcement sources with knowledge of the investigation said the Colorado searches were part of a probe that began with Zazi and led to New York.
CNN: Man questioned in alleged terror plot declines more FBI talks
Law officials in New York with knowledge of the investigation told The Associated Press the attack was to take place on the Canadian side of the border.
But according to law enforcement sources with knowledge of the investigation, the Colorado searches were part of a probe that began with Zazi and led to New York.
After that, the Justice Department plans to brief the victims and their families in Washington before publicly releasing details of the case against Ivins, several sources with knowledge of the investigation said.
Russian authorities intercepted a phone call in early 2011 from one of the Tsarnaev brothers in the United States to their mother in Dagestan, an official with knowledge of the investigation told CNN over the weekend.
Freeh's group has been poring over internal Penn State e-mails and has interviewed a past university official about the way Paterno influenced a variety of disciplinary matters, according to a source with knowledge of the investigation.
Fenton was so concerned about Holmes' behavior that she mentioned it to her colleagues in early June, saying he could potentially be a danger to others, CNN affiliate KMGH reported, citing sources with knowledge of the investigation.
An internal Penn State investigation headed by former FBI Director Louis Freeh also has turned up billing records from Penn State officials to the university's outside council around the time of the 2001 incident showing Penn State was "researching its legal obligations" for reporting the assault, according to a source with knowledge of the investigation.
There were no apparent constraints Monday, the law enforcement source with firsthand knowledge of the investigation said.
Investigators have been asking Tsarnaev whether there are more bombs, explosives caches or weapons beyond those already found by police, and if anyone else was involved in the attacks, a source with direct knowledge of the investigation told CNN.
Police searched the suspect's home, "a short distance" from the temple, on Sunday evening, according to a law enforcement source with direct knowledge of the investigation.
After a flurry of interagency meetings, however, Homeland Security decided to leave the policy director, Faisal Gill, in place, according to two government officials with knowledge of the Alamoudi investigation.
CENTERFORSECURITYPOLICY: Islamist penetration of Homeland Security?
More often, the three would be in different rooms, though they interacted occasionally and came to "rely on each other for survival, " said a law enforcement source with direct knowledge of the investigation.
Investigators have been asking Tsarnaev whether there are more bombs, explosives caches or weapons beyond those already found by police, and if anyone else was involved in the attacks, a source with first-hand knowledge of the investigation told CNN.
People with knowledge of the IPO plans said the overhang of the investigation is one factor behind the delay of the IPO.
Even if the PSNI decides to launch a new investigation, one former officer who is familiar with the original RUC investigation says he does not believe there will be convictions unless someone with direct knowledge of the attack comes forward and provides information about who was responsible.
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