Faisal Shahzad, the man officials suspect tried to cause a giant fireball in New York’s Times Square, was arrested late Monday on a flight to Dubai at Kennedy Airport by FBI agents and NYPD, authorities said.

Shahzad, who is now a U.S. citizen, had recently returned from a trip to Pakistan, where he was born, according to the Associated Press. Shahzad claimed he acted alone when he drove an SUV into Times Square over the weekend filled with explosives, but federal officials don’t seem convinced he didn’t have help.

“[We] will not rest until we have brought everyone responsible to justice,” Attorney General Eric Holder said Tuesday.

Although officials haven’t drawn a public connection between the Pakistani Taliban, which boasted responsibility for the bombing attempts in several videos, up to eight people in Pakistan have been detained for questioning, according to Fox News.

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The SUV was spotted over the weekend by an alert NYC street vendor. He saw it smoking and told police, who called out the bomb squad to take apart the crude device, which included propane tanks and fertilizer.

Shahzad’s last known home was searched in Bridgeport, CT., and he was expected to make an appearance in court on Tuesday.

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