N.Y. / Region

Evidence Mounts for Taliban Role in Bomb Plot

Faisal Mahmood/Reuters

A boy looked through the gate of a home belonging to the family of Faisal Shahzad in Mohib Banda, Pakistan, on Wednesday.

WASHINGTON — American officials said Wednesday that it was very likely that a radical group once thought unable to attack the United States had played a role in the bombing attempt in Times Square, elevating concerns about whether other militant groups could deliver at least a glancing blow on American soil.

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Officials said that after two days of intense questioning of the bombing suspect, Faisal Shahzad, evidence was mounting that the group, the Pakistani Taliban, had helped inspire and train Mr. Shahzad in the months before he is alleged to have parked an explosives-filled sport utility vehicle in a busy Manhattan intersection on Saturday night. Officials said Mr. Shahzad had discussed his contacts with the group, and investigators had accumulated other evidence that they would not disclose.

On Thursday, interrogators from the United States and Pakistan were questioning four members the banned militant group Jaish-e-Muhammad, in the Pakistani capital, Islamabad, in connection with the Times Square plot, according to a Pakistani security official. The official did not identify the militants. On Wednesday, Mr. Shahzad, the 30-year-old son of a retired senior Pakistani Air Force officer, waived his right to a speedy arraignment, a possible sign of his continuing cooperation with investigators.

As his interrogation continued, Department of Homeland Security officials directed airlines to speed up their checks of new names added to the no-fly list, a requirement that might have prevented Mr. Shahzad from boarding a flight to Dubai on Monday night before his arrest at Kennedy International Airport.

The failed attack has produced a flurry of other proposals to tighten security procedures, including calls by members of Congress to more closely scrutinize passengers who buy tickets with cash, as Mr. Shahzad did. Senator Joseph I. Lieberman, independent of Connecticut, and Senator Scott Brown, Republican of Massachusetts, proposed stripping terrorism suspects of American citizenship, and Mayor Michael R. Bloomberg asked Congress to block the sale of firearms and explosives to those on terrorist watch lists.

American officials, speaking about the continuing inquiry only on condition of anonymity, gave few details about what Mr. Shahzad had told investigators, and said their understanding of the plot would evolve as a dragnet spanning two continents gathered more evidence.

One senior Obama administration official cautioned that “there are no smoking guns yet” that the Pakistani Taliban had directed the Times Square bombing. But others said that there were strong indications that Mr. Shahzad knew some members of the group and that they probably had a role in training him.

In a video on Sunday, the Pakistani Taliban claimed responsibility for the attempted bombing.

One issue that investigators are vigorously pursuing is who provided Mr. Shahzad cash to buy the S.U.V. and his plane ticket to Dubai, in the United Arab Emirates. “Somebody’s financially sponsoring him, and that’s the link we’re pursuing,” one official said. “And that would take you on the logic train back to Pak-Taliban authorizations,” the official said, referring to the group.

American officials said it had become increasingly difficult to separate the operations of the militant groups in Pakistan’s tribal areas. The region, they said, has become a stew of like-minded organizations plotting attacks in Pakistani cities, across the border into Afghanistan, and on targets in Western Europe and the United States.

Besides the Pakistani Taliban and Al Qaeda, groups operating in the tribal areas are the Haqqani Network and the Kashmiri groups Lashkar-e-Taiba and.

There is no doubt among intelligence officials that the barrage of attacks by C.I.A. drones over the past year has made Pakistan’s Taliban, which goes by the name Tehrik-i-Taliban, increasingly determined to seek revenge by finding any way possible to strike at the United States.

The C.I.A.’s drone program in Pakistan, which was accelerated in 2008 and expanded by President Obama last year, has enjoyed strong bipartisan support in Washington in part because it was perceived as eliminating dangerous militants while keeping Americans safe.

But the attack in December on a C.I.A. base in Afghanistan, and now possibly the failed S.U.V. attack in Manhattan, are reminders that the drones’ very success may be provoking a costly response.

Last March, when the Pakistani Taliban leader Baitullah Mehsud boasted that his group was planning an attack on Washington that would “amaze everyone in the world,” many American officials dismissed his claims as empty bravado. His network, they said, had neither the resources nor the reach to pull off an attack far beyond its base in the mountains of western Pakistan.

But the attempted attack on Saturday has forced something of a reassessment, especially as American officials see militant groups determined to score a propaganda victory by pulling off even the crudest of attacks.

Sabrina Tavernise contributed reporting from Islamabad, Pakistan.