The officials briefed on the intelligence, speaking on condition of anonymity because the report has not yet been released, say the experts identified a structure there that some believe is a testing capsule for what is called an "implosion device".
The officials, who spoke about the classified intelligence on the condition of anonymity, said he might have encouraged a plan for attacks in European cities modeled after the ones on Mumbai, India, in 2008.
Both intelligence on the conditions in the fruit and tree nut industries as well as data tables showing acreage, production, season average grower-price, and value of various fruits from a number of states are encompassed in the report.
It emerged during the trial of Mr. Motassadeq that the American authorities had given information from the interrogations of a number of suspects to German intelligence on strict conditions that forbade revealing details in court.
"We have assessed that the explosion in North Korea was a sub-kiloton explosion," said one intelligence official, speaking on condition of anonymity because of the sensitivity of the issue.
The dead included 14 policemen and a colonel belonging to the intelligence agency, according to an intelligence official speaking on condition of anonymity because he was not authorized to speak to the news media.
"There are powerful reasons to believe that terror networks around Baitullah Mehsud were responsible," said one American intelligence official, speaking on condition of anonymity because he was not authorized to speak publicly on the matter.
"This report is simply and absolutely wrong," said one American official, who would speak of the intelligence contacts only on condition of anonymity.
But a senior intelligence official, speaking on condition of anonymity, said: "The proposal is unworkable and would hamper rather than enhance the nation's intelligence efforts at a critical time.
