Published: May 05, 2010 10:41 AM EDT

New York, NY.-Faisal Shahzad, the would-be Times Square bomber, is expected to be arraigned in New York City on Wednesday.

Faisal Shahzad will face a number of charges when he appears in New York Federal Court. Among them, attempting to use a weapon of mass destruction and trying to kill Americans.

"If successful it could have resulted in a lethal terrorist attack, causing death and destruction in the heart of New York City," said Attorney General Eric Holder.

The Pakistani born US citizen confessed Tuesday that he rigged a Nissan Pathfinder with a homemade bomb and tried to blow up Times Square.

He was just moments away from making a clean getaway Monday night when authorities hauled him off a dubai-bound plane. Passengers aboard the jetliner had no idea what was happening.

"We taxied, then we went back to the airport. That's when we became somewhat concerned but nobody was terribly nervous," said Passenger Faye Roy.

Federal officials are offering very little details about a possible motive in the case but they do say Shahzad is cooperating and providing valuable information.

Investigators were busy digging for more clues. They found bomb making materials at Shahzad's Bridgeport, Connecticut apartment.

"We want to know as much as we can about his background, where he's gone, what's he's done, so all of those things are being explored," said Attorney General Eric Holder.

Authorities are also questioning Shahzad's friends back in Pakistan. The 30-year-told told investigators he acted alone but his involvement with a

terror training camp in Pakistan has some officials thinking otherwise.