The Midland City official said law enforcement agents had been observing Dykes with some sort of camera, which is how they saw that he had a gun.
But a U.S. official and a law enforcement source said Sunday the Russian government's request was vague.
President Obama has held a meeting in the White House about what response there might be with his chief law official.
But the Russian government's request was vague and the lack of specifics limited how much the FBI was able to investigate Tsarnaev, according to a U.S. official and a law enforcement source.
But the Russian government's request was vague and that lack of specifics limited how much the FBI was able to investigate Tamerlan, according to a U.S. official and a law enforcement source.
"While their official role is law enforcer, tax collector and advertiser, license plates moonlight as reporters, artists, sociologists, historians, psychologists and statisticians, " he says in the opening of his book, A Moving History.
My recommendation is to ignore the official current-law scoring estimates of the federal budget, unless you have sufficient analytical resources to sort through the legislative details, line by line, and figure out what is really going on.
WSJ: William Poole: A Primer for Understanding Obama's Budget
The news cooperative said its source was a law enforcement official speaking on condition of anonymity.
The capture was confirmed Thursday by two administration officials and a federal law enforcement official.
One law enforcement official remains skeptical of Ortiz's innocence: District Attorney Frank A. Sedita III.
Somehow, somewhere, they slipped a camera into the hideout, a law enforcement official said.
The blasts were likely detonated by timers -- not by cell phones, a law enforcement official said.
CNN: Source: Bombs were likely in pressure cookers in backpacks
The country's top law enforcement official says intelligence agencies are investigating up to two dozen suspected plots.
Another law enforcement official also balked at the notion of enforcing federal gun laws he considers unconstitutional.
CNN: Oregon sheriff: 'Unconstitutional' gun control laws won't be enforced
The federal law enforcement official told CNN that such a hit in the system doesn't prompt automatic action.
But a U.S. federal law enforcement official with direct knowledge of the probe said he remains a suspect.
The lack of specifics limited how much the FBI was able to investigate Tamerlan, the law enforcement official said.
The two letters had the same postmark, a law enforcement official who had been briefed on the investigation, told CNN.
CNN: Threatening letters to Bloomberg test positive for ricin
Reports indicate the shooting occurred in an outside area between the library and the cafeteria, a law enforcement official said.
CNN: 3 wounded in Houston college shooting; two people detained
Authorities believe the brothers bought bomb components locally but believe their guns came from elsewhere, another federal law enforcement official said.
After 15 days of questioning, Shahzad invoked his right to an attorney at Tuesday's hearing, a federal law enforcement official said.
Corkins legally purchased the handgun from a gun shop in Virginia within the last week, according to a law enforcement official.
"Preliminary information indicates the agent took actions to defend himself, " said a federal law enforcement official with direct knowledge of the case.
But the information the teenager gave investigators in two sessions of questioning has produced good leads, a U.S. law enforcement official said.
The previous day, a law enforcement official said at least one of the bombs that exploded was set off by remote control.
Court documents show Langley had tried to bribe a law enforcement official posing as a broker willing to pump up Pollution's shares.
One was excused after he expressed skepticism about any law enforcement official.
Adam Lanza had no known criminal record, a law enforcement official said.
Sulaiman Abu Ghaith is being held in New York, and will appear in court Friday to face federal charges, the law enforcement official said.
Peter Lanza was taken in for questioning, but there was no indication he would face any charges, one U.S. law enforcement official told CNN.
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