Chertoff: Plot 'Suggestive' of Al-Qaida

The Bush administration issued its highest terrorism alert ever for commercial flights from Britain to the United States.

The terror scheme disrupted in London is "suggestive of an al-Qaida plot," the Bush administration said Thursday as it issued its highest terrorism alert ever for commercial flights from Britain to the United States and raised the threat level for all domestic and international flights.

Homeland Security Secretary Michael Chertoff said there was no indication of plotting in the United States but said officials cannot assume that the terror operation in Britain had been completely thwarted.

The administration raised the threat level for flights from Britain to "red," designating a severe risk of terrorist attacks. All other flights, including all domestic flights in the United States, were put under an "orange," alert - one step below the highest level.

The U.S. government banned all liquids and gels from flights, including toothpaste, makeup, suntan lotion. Baby formula and medicines were exempted.

Chertoff said the alleged plot appeared to be engineered by al-Qaida, the terrorist group that carried out the Sept. 11, 2001, attack against the United States.

"It was sophisticated, it had a lot of members and it was international in scope," said Chertoff. "It was in some respects suggestive of an al-Qaida plot."

He added, however, that "because the investigation is still underway we cannot yet form a definitive conclusion."

Chertoff said the plotters were in the final stages of planning before execution. "We were really getting quite close to the execution phase," he said. He said it was unclear whether the alleged plot was linked to the upcoming fifth anniversary of the Sept. 11 strikes.

Attorney General Alberto Gonzales said the operation could "potentially kill hundreds of innocent people." Britain said 21 people had been arrested, including the alleged "main players" in the plot.

FBI Director Robert Mueller also pointed at al-Qaida. "This had the earmarks of an al-Qaida plot," he said.

Chertoff said it envisioned multiple explosions in multiple aircraft.

The new security measures caused long backups and delays at airport security checkpoints throughout the United States and around the world. "We are taking some very serious and inconvenient measures," Chertoff said. He said it was advisable to have more protection and scale it back.

The alleged plot was "as sophisticated as any we have seen in recent years as far as terrorism is concerned," Chertoff said.

Chertoff said there was no indication of any plotting in the United States but the United States was taking step to protect against unseen threats or copycat attacks. "We cannot assume that this threat has been completely thwarted," the secretary said.

"There's sufficient uncertainty as to whether the British have scooped up everybody," Chertoff said.

British authorities said the plan envisioned bringing down a number of aircraft with midflight explosions. Chertoff said the terrorists planned to bring various bomb components in a benign state aboard the planes and combine them once the planes were aloft to create and detonate explosive devices.

Terrorists specifically had targeted United, American and Continental airlines, two U.S. counterterrorism officials said. One said the terrorists had hoped to target flights to major airports in New York, Washington and California, all major summer tourist destinations.

American and United flights were turned into terrorist weapons on Sept. 11, 2001, when they were hijacked and crashed.

Hastily printed signs were posted at major airports warning passengers in red capital letters, "No liquid or gels permitted beyond security."

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