BOSTON - Three Pakistani men who authorities say supplied funds to Times Square car bomb suspect Faisal Shahzad were arrested Thursday in a series of raids across the Northeast as the FBI followed the money trail in the failed attack.
Investigators said it was not yet clear whether the three men knew how the money was going to be used.
Afab and Pir Khan were seized in the Boston area, another in Maine, Mohamad Rahman -- were arrested as federal authorities searched homes and businesses in a coordinated series of raids centered in the Boston suburbs, on New York's Long Island and in New Jersey.
They were arrested on immigration violations -- administrative, not criminal, charges. They were not charged with any terrorism-related crimes. Their names were not released.
The raids resulted from evidence gathered in the investigation into the Times Square bomb attempt two weeks ago. FBI spokeswoman Gail Marcinkiewicz gave assurances Thursday that there was "no known immediate threat to the public or any active plot against the United States."
In Washington, Attorney General Eric Holder said investigators believe there is evidence that the men were providing Shahzad, a Pakistan-born U.S. citizen, with money , but they have yet to determine whether the men knew the funds might have been intended for a terrorist act.
U.S. Sen. Susan Collins, R-Maine, said there was "not a direct tie" between the man arrested in South Portland, Maine, and the Times Square car bomb suspect.
Authorities have been investigating whether Shahzad -- who authorities say needed only a few thousand dollars to buy the used SUV and the bomb components used in the attempted May 1 attack -- was financed from overseas.
Tracking the money to Shahzad will involve interviewing a large number of people and will likely be a more difficult task than would tracing funds through more conventional financial networks, the official said.
Two of the men under arrest overstayed their visas and the third is already in removal proceedings, said another law enforcement official, who was not authorized to discuss the ongoing investigation and spoke on condition of anonymity.
Shahzad, 30, has waived his right daily to appear in court since his May 1 arrest on charges he tried to blow up a van packed with a gasoline and propane in Times Square .
Kifyat Ali, a cousin of Shahzad's father, has called Shahzad's detention "a conspiracy so the (Americans) can bomb more Pashtuns," a reference to a major ethnic group in Peshawar and the nearby tribal areas of Pakistan and southwest Afghanistan. He has insisted that Shahzad "was never linked to any political or religious party" in Pakistan.
Shahzad, a budget analyst who lives in Bridgeport, Conn., returned to the U.S. in February from five months in Pakistan, where authorities say he claims to have received training in making bombs.
Authorities raided a home in Watertown and a Mobil gas station and a vehicle in Brookline , another Boston suburb; a condominium in Cherry Hill, N.J.; a print shop in Camden, N.J., and two Long Island homes, law enforcement officials said.
Ashim Chakraborty, who owns a home raided in Centereach, N.Y., said FBI and police wanted to interview a Pakistani man and an American woman who live in the basement. The woman, who did not identify herself, was still in the basement Thursday afternoon, telling reporters only, "Drop dead. I'm an American."
Pakistan has detained at least four people with alleged connections to Shahzad.