Pakistan arrest offered hints, no details on planned hits

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The recent arrest of an al Qaeda terrorist in Pakistan provided some clues that terrorists were planning attacks on trains and buses, but there were no specific warnings of the bombings in London yesterday, U.S. officials said.

The lack of a specific warning highlights continuing U.S. intelligence shortcomings in spying on al Qaeda and related Islamist groups, which are suspected in the attacks.

"I'm not aware of any specific intelligence that suggested this was going to take place," Homeland Security Secretary Michael Chertoff told reporters after the bombings.

Officials said the bombings likely were carried out by a "pop-up" cell of Islamic militants loyal to, and perhaps supported by, al Qaeda, delivering a stark reminder of how difficult it is to penetrate terror plots by groups that Western intelligence services have not identified.

A U.S. intelligence official said Washington was not aware of the "Secret Organization Group of al Qaeda Jihad Organization in Europe," which took responsibility for the four explosions in subways and a double-decker bus.

A government terrorism expert also said the attack is part of a revival of militant activity in Europe as radical clerics recruit jihadists to fight in Iraq against the U.S.-led coalition, of which Britain is a key member.

"This is a manifestation of a trend we've seen over the past 18 months of greatly heightened al Qaeda and pro-al Qaeda activity in Europe designed mainly to recruit for the battlefields in Iraq and, more lately, in Afghanistan," said Kenneth Katzman, a terrorism expert at the Congressional Research Service.

Other intelligence officials said there have been few reports in recent months indicating possible attacks by Islamic terrorists in the United States or abroad. One U.S. security agency official said there had been some "extremely vague" intelligence reporting in the past several weeks indicating that al Qaeda was planning a "Madrid-style attack."

Al Qaeda-linked terrorists were behind the attack in Spain's capital on March 11, 2004, killing almost 200 people. The attacks involved 10 nearly simultaneous bombings of trains during rush hour, eerily similar to the London attacks.

The intelligence reports on possible train and bus bombings followed the May arrest in Pakistan of al Qaeda's No. 3 leader, Abu Faraj al-Libbi, who is now in U.S. custody, the official said.