Federal agents have raided several locations in the northeastern United States as part of an investigation into the failed Times Square car bombing earlier this month, the FBI said on Thursday.
"We can confirm that several search warrants have been executed in the northeast in connection with the Times Square bombing investigation," FBI spokeswoman Gail Marcinkiewicz told AFP.
"Two individuals encountered during the searches were taken into federal custody in connection with immigration violations," she added.
Marcinkiewicz declined to specify further where the raids occurred, but reports said a home in the Massachusetts town of Watertown was among those targeted by agents from the Federal Bureau of Investigation on Thursday morning.
A Pakistani-American, Faisal Shahzad, was arrested last week in connection with the botched May 1 attack, after he allegedly parked a car laden with a home-made bomb in New York's Times Square.
Shahzad, 30, faces five terrorism-related charges. But he has still not appeared in court or been seen in public since his dramatic arrest on May 3 when he was hauled off a flight to Dubai.
Marcinkiewicz said the searches were "all in connection with Times Square."
"This does not relate to any known immediate threat to the American people or the United States," she said.