The five senior leaders of the U.S. intelligence community told a Senate panel Tuesday they are "certain" that terrorists will attempt another attack on the United States in the next three to six months.
The warning came during the annual threat briefing to Congress in response to questions from Sen. Dianne Feinstein, California Democrat and the chairman of the Senate Select Committee on Intelligence, who asked, "What is the likelihood of another terrorist-attempted attack on the U.S homeland in the next three to six months? High or low?"
"An attempted attack, the priority is certain, I would say," said Director of National Intelligence Dennis C. Blair, a retired admiral.
Four other intelligence agency leaders who appeared at the hearing with Adm. Blair said they agreed with the assessment.
They included CIA Director Leon E. Panetta, FBI Director Robert S. Mueller, Lt. Gen. Ronald L. Burgess Jr., the director of the Defense Intelligence Agency, and John Dinger, the acting assistant secretary of state for intelligence and research.
Adm. Blair outlined the major threats facing the United States in addition to a possible terrorist attack. They include:
-- The threat of major attacks on U.S. computer networks and infrastructure.
-- The increasingly dangerous Taliban insurgency in Afghanistan.
-- Instability in nuclear-armed Pakistan.
-- Iranian and North Korean missile and nuclear programs.
-- China's military buildup.
-- Efforts by the anti-U.S. government of Venezuela to develop closer ties with Iran, China and Russia.
The warning about the threat of another attempted attack, like the failed Christmas Day bombing of a Northwest Airlines jet, was in keeping with the sober public assessment of threats outlined last year by Adm. Blair.
"In our judgment, al Qaeda also retains the capability to recruit, train and deploy operatives to mount some kind of an attack against the homeland," according to his written testimony. The recent arrests of an al Qaeda cell led by Najibullah Zazi, the attempted bombing of the Northwest Airlines jet en route from Amsterdam to Detroit, and the Fort Hood, Texas, shooting rampage, allegedly by Army Maj. Nidal Malik Hasan, all suggest al Qaeda has come close to pulling off mayhem inside the United States.
Adm. Blair's message was sobering: "Counterterrorism efforts against al Qaeda have put the organization in one of its most difficult positions since the early days of Operation Enduring Freedom [in Afghanistan] in late 2001," he said. "However, while these efforts have slowed the pace of anti-U.S. planning and hindered progress on new external operations, they have not been sufficient to stop them."
The testimony specifically warned that al Qaeda is capable of another attack on the United States, marking a change from the 2009 assessment that emphasized the group's intentions to attack U.S. soil but said their capabilities to launch an attack on the homeland were limited.
Meanwhile, Metro Transit Police on Tuesday conducted an anti-terrorist exercise at a busy underground Metro station in Washington, D.C.
Adm. Blair testified that al Qaeda is eyeing targets the group in the past attempted to attack, including commercial jets and financial institutions in New York City, and the Washington Metro system.
Mr. Blair's testimony also focused on al Qaeda's continuing efforts to obtain biological, chemical and nuclear weapons, but he said he would only discuss details in a closed session.
Following Mr. Blair's testimony, CIA Director Panetta pointed out that the biggest problem for America's spies is tracking the "lone wolf" operative who has no background in terrorism.
Mr. Blair said part of the problem is that al Qaeda has switched tactics from spectacular "multiple-cell-based attacks" to harder to detect smaller-scale operations.
"The recent successful and attempted attacks represent an evolving threat in which it is even more difficult to identify and track small numbers of terrorists recently recruited and trained and short-term plots than to find and follow terrorist cells engaged in plots that have been ongoing for years," Mr. Blair said.
Mr. Blair's written testimony touched on a wide range of topics -- from Latin America to the effects of global climate change on U.S. strategic interests in the world.
He began his testimony with a stark warning to Congress about the capability of hackers to launch devastating attacks on U.S. computer networks.
"Malicious cyber-activity is occurring on an unprecedented scale with extraordinary sophistication," he said. The director added that the technology today favors hackers and other criminals and not nations looking to protect their networks.
On Iran, Mr. Blair said the intelligence community believed that Iran was preparing the groundwork for building nuclear weapons, but that Tehran had made no political decision to build the arms. Despite political turmoil that has brought hundreds of thousands of protesters into the streets since the June 12 presidential elections, Iran's decision-making process would remain the same, he said.
Overall, Mr. Blair said he gave he protesters little chance for success. "Strengthened conservative control will limit opportunities for reformers to participate in politics or organize opposition," he stated. "The regime will work to marginalize opposition elites, disrupt or intimidate efforts to organize dissent and use force to put down unrest."
The U.S. intelligence community in the past failed to predict political events in Iran. For example, a noted CIA assessment of Iran in the fall of 1978 predicted there was no prospect for an Islamic revolution -- a prediction that proved wrong within five months.