Authorities Friday continued to probe ties between the accused Times Square bomber and overseas groups as they hunted a courier they believe delivered the suspect money for the botched terrorist attack, according to a law enforcement officer.

Investigators have the name of a courier they think channeled overseas cash to accused car bomber Faisal Shahzad and are searching for him, according to the unnamed officer cited by The Associated Press.

Locating the source of the $1,300 Shahzad allegedly paid for the 1993 Nissan Pathfinder and other money for bomb-making materials could help answer the question of whether Shahzad acted alone.

As another day passed without Shahzad making a court appearance, to the growing consternation of some in the legal community, officials here and in Pakistan remained sharply divided on the question.

Gen. David Petraeus, commander of the wars in Iraq and Afghanistan, called Shahzad a "lone wolf" who didn't have direct contact with militants in Pakistan but was inspired by them.

Pakistan Interior Minister Rehman Malik said Friday he has not seen any evidence linking Shahzad to the Pakistan Taliban but still believes Shahzad did not act alone.

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"All those leads, suggesting it was his own action, I will not accept that. I'd like to see details," he said in Beijing. "Obviously, he had bought a vehicle filled with explosives. It looks a bit difficult [to say] that he's [working] alone."

Shahzad allegedly told interrogators he underwent bomb-making training in Pakistan, but investigators have yet to confirm that.

Determining what makes a "lone wolf" is not easy, said Gary LaFree, director of the National Consortium for the Study of Terrorism and Responses to Terrorism at the University of Maryland.

Federal officials sometimes get "sloppy" with their definitions, LaFree said, and there seems to be a sliding scale for what makes a suspected terrorist a "lone wolf" instead of a member of a terror cell.

Shahzad spent a fourth day since his arrest late Monday night without an appearance in federal court, and nothing was scheduled for the weekend. Although the Justice Department says he is providing information, officials have refused to say where he is being held - or even whether he has a lawyer.

Suspects are supposed to be presented in court within 48 hours of their arrest, but can waive their right to a speedy arraignment. The government's position, officials say, is that a suspect can execute a waiver without a lawyer, and the waiver gives the government broad flexibility on when to produce the defendant.

The handling of Shahzad, however, is beginning to raise concerns among some legal experts, who say the extended detention seems designed to exploit him without the benefit of advice from a court-appointed lawyer.

"You are having law enforcement agents provide him with his only options," said Manhattan defense lawyer Gerald Lefcourt, a former head of the National Association of Criminal Defense Lawyers.

"This is an American citizen, not an enemy combatant. He has a right to be arraigned, notified of the charges by a judge, and to have counsel represent him. We don't know if any of those things have happened."

"Even someone like me, for the first couple of days you give the government a little leeway given the circumstances," said Norman Siegel, former head of the New York Civil Liberties Union. "But now that we're in the fourth day, you begin to raise questions, and by next week there will be even more serious questions."

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With Tom Brune

and John Riley