The NIPC bulletin also noted that terror suspects have shown "interest" in insecticides and pest-control products at several undisclosed Web sites.

At the same time, the Washington Times reported Thursday that U.S. intelligence agencies have issued an internal alert that Islamic terrorists are planning another large attack on America.

The Times said the warning was issued in a classified report that said one target was a U.S. nuclear power plant or one of the Energy Department's nuclear facilities.

According to the Times, officials familiar with the report said it contained six potential methods and targets of attack, including:

• A bombing or airline attack on a nuclear power plant or other U.S. nuclear facility;

• A bombing against a U.S. warship in Bahrain, headquarters of the U.S. Navy's 5th Fleet;

• A suicide airliner attack similar to the Sept. 11 assaults on the World Trade Center and Pentagon;

• A vehicle bombing in Yemen.

FBI Director Robert Mueller on Thursday said there had been no new terrorist threats or warnings in the last few days.

On Wednesday, U.S. officials released an unclassified report that said they had uncovered rudimentary diagrams of nuclear weapons in a suspected Al Qaeda safehouse in Kabul, providing further evidence of Al Qaeda's efforts to acquire such weapons to use in terrorist attacks.

The unclassified report, submitted by CIA Director George Tenet to Congress, said that the "diagrams, while crude, describe essential components — uranium and high explosives — common to nuclear weapons."

The report added that the terrorists aren't believed to have a functional weapon.

Other evidence obtained in Afghanistan shows that Al Qaeda operatives have fallen for a number of scams in their attempts to acquire nuclear weapons and other weapons of mass destruction, a senior government analyst said.

"That's good news for us," said Gary Richter, a terrorism expert with the Energy Department's Sandia National Laboratories. "It shows they really don't know what they are doing. If they knew to turn away these scam artists, it would be frightening."

Richter said he has examined several items recovered from Al Qaeda caches in Afghanistan, all of which were believed to be tied to the terrorist group's attempts to develop or buy weapons of mass destruction, including nuclear devices. From them, Richter concluded that Al Qaeda operatives tried to buy such weapons several times, paying cash for items that turned out to be worthless.

"They'll buy junk," he said, adding that they appear to be very naive regarding nuclear weapons.

Richter declined to describe the items he has examined, but said they showed an encouraging lack of technical sophistication in the group. He did not know how much money Al Qaeda had spent on trying to buy these weapons.

"We're not talking about dullards. But their forte, their whole M.O., tends to be more brute force than high-tech," he said. "Al Qaeda is not a techie kind of organization, and they've fallen flat on their faces in some areas."

He also declined to say from whom Al Qaeda tried to purchase the weapons. U.S. troops and intelligence officers searching through abandoned caves, safehouses and camps belonging to the group have discovered canisters and chemistry apparatus, some of which had Russian markings.

Richter echoed statements from U.S. defense and intelligence officials that Al Qaeda has developed a crude ability to use industrial chemicals as weapons — like those used on the battlefields in the early part of World War I.

But he said the terrorist group lacks the sophistication to deliver these weapons in a way that would kill mass numbers of people. Other officials have said Al Qaeda could probably deploy chlorine, phosgene and some biological toxins as weapons.

Much of the terrorists' interest centers on chemical weapons, such as cyanide salts, that could be used to contaminate food and water supplies and assassinate individuals, says the Tenet report.

Other evidence uncovered in Afghanistan includes diagrams of American nuclear power plants showing Al Qaeda's interest in striking these targets, but it's unclear how far along those plans were, a defense official said.

Fox News' Carl Cameron and The Associated Press contributed to this report.

http://www.foxnews.com/story/0,2933,44395,00.html