Lawmakers briefed on the intelligence called the threat reporting among the most serious they've seen in recent years, reminiscent of the intelligence chatter that preceded the September 11, 2001, attacks.
"There is a significant threat stream and we're reacting to it," General Martin Dempsey, the chairman of the Joint Chiefs of Staff, said in an interview with ABC.
Dempsey said the specific locations and targets were not known but "the intent is to attack Western, not just US interests."
Representative Dutch Ruppersberger, the ranking Democrat on the House Intelligence Committee, told ABC's "This Week" that Al-Qaeda's "operatives are in place."
He said the United States knows this "because we've received information that high level people from Al-Qaeda in the Arabian Peninsula are talking about a major attack and these are people in the high level."
ABC News cited an unnamed US official as saying there was concern that Al-Qaeda might deploy suicide attackers with surgically implanted bombs to evade security.
He said an attack appeared to be "imminent," possibly timed to coincide with the last night of Ramadan, the Muslim holy month.
The suspected plot comes against the backdrop of a series of recent prison breaks in Iraq, Libya and Pakistan in which thousands of inmates have escaped, he said, creating additional risks.
US sensitivity to embassy security also has been heightened by the Al-Qaeda attack on the US mission in Benghazi, Libya, last September 11 that claimed the life of the US ambassador and three other Americans.
The NSA's congressional supporters were quick to point to the role of electronic intercepts in obtaining the latest intelligence, while dismissing suggestions it also served to divert attention from the agency's role in scooping up Americans' phone and Internet data.
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