“This attack on the United States will be a revenge attack for all the mujahedeen who have been martyred,” Shahzad said in the 40-minute video released today to an Arab news network, al Arabiya.

An Al Arabiya producer said the tape was to be released after his death.

But American law enforcement authorities say Shahzad “ran away” after parking his bomb-laden vehicle in a place where he thought hundreds of people would be killed or injured. He used a series of alarm clocks as timers to make sure he would be far away when the bomb went off, investigators say.