FBI seeks 4 suspected of terrorist activities
WASHINGTON (CNN) -- The FBI has sent an alert to law enforcement agencies across the country for them to be on the lookout for four men who, according to intelligence information, "are involved in terrorist activities and may pose a threat to U.S. citizens and interests in the United States and abroad."
The FBI has previously put out alerts for two of the men -- Adnan El Shukrijumah and Abderraouf Jdey. Officials previously have said that information on El Shukrijumah was garnered from interrogations with Khalid Shaikh Mohammed, who U.S. officials believe organized the September 11 terrorist attacks against the United States.
The other two men in the latest alert are Karim Mejjati and Zubayr Al-Rimi. (Gallery: FBI seeks four men)
The FBI did not say what specific information prompted the new alert.
The whereabouts of the four men are unknown, and the alert asks that they be detained if found.
The FBI bulletin provides some descriptive information about the men:
• Adnan El Shukrijumah, 28, born in Saudi Arabia. He has a passport issued by Guyana, a U.S. Social Security account number and Florida driver's license.
• Abderraouf Jdey, 38, born in Tunisia. His last known address was in Montreal, Quebec -- the Canadian city in which his current passport was issued.
• Karim El Mejjati, 35, born in Morocco. He is known to have entered the United States between 1997 and 1999. He has a Moroccan identity card. The alert lists several passport numbers for him issued by France.
• Zubayr Al-Rimi, born in Saudi Arabia and married to a Moroccan woman.
The agency's Web site said the men are armed and considered dangerous.
Advisory: Al Qaeda planning new U.S. attacks
In a separate development Thursday, the U.S. Department of Homeland Security issued an advisory warning that al Qaeda is working on plans to hijack airliners flying between international points that pass near or over the continental United States.
A department official said that most of the flights fitting this description originate in Canada and that U.S. officials have been working with Canadians over the past month to ensure they are improving screening and other security measures.
One government official noted, however, the United States has no authority to require security measures of non-U.S. carriers whose flights originate outside the country.
The advisory was issued because of concerns about the upcoming second anniversary of the September 11 attacks, a recent uptick in intelligence information and threats to aviation that continued in the summer.
Issued to state and local authorities and the private sector, the advisory said terrorist operatives have been studying countries to determine which have the least stringent requirements for entry. That could be a factor in their consideration of which flights would be easiest to board and take control of, the advisory said.
The advisory includes a laundry list of possible attack scenarios, saying al Qaeda may be researching how to disseminate diseases and toxins by contaminating water and food, or aerosolizing an agent in an enclosed space.
But the advisory said there is no specific information on individual targets or dates that would warrant raising the nation's threat alert level from yellow (elevated) to orange (high).
Some tactical information and six pages of suggested protective measures were edited out of the version of the advisory given to the press.
Risk of multiple attacks cited
The advisory said that arrests of key al Qaeda members over several months "may have delayed or even disrupted some plans," but a Homeland Security official declined to provide any details.
The official said that interrogations of those detainees produced some of the information contained in the advisory. Intercepted communications and materials seized in raids of al Qaeda safe houses were other sources of the intelligence, the official said.
The advisory cites the risk of multiple attacks against the United States and U.S. interests overseas. It notes recent mass-casualty attacks in Saudi Arabia, Indonesia and Iraq, "suggesting that 'soft' targets with minimum physical security measures could be viewed as attractive options in the U.S."
Among the sorts of soft targets mentioned in operational plans are apartment complexes, gas stations and restaurants.
The advisory also said critical infrastructure could be hit because of the "potentially significant economic and psychological impacts."
Examples of critical infrastructure listed as possible targets are nuclear power plants and other energy facilities, petroleum and chemical facilities, the transportation sector, water systems and the food supply.
The advisory notes that al Qaeda has successfully used suicide bombers and warns that terrorists "will employ novel methods to artfully conceal suicide devices."
Earlier Thursday, Homeland Security Secretary Tom Ridge held a conference call with state officials to tell them there are no plans at present to raise the threat level in advance of the September 11 anniversary.
According to one participant in the call, Ridge said there had been an uptick in threat information, but not in the quantity or quality that would warrant moving from yellow to orange.
CNN Correspondents Kelli Arena and Jeanne Meserve and Producer Kevin Bohn contributed to this report.