In the video released by the FBI, the Operational Technology Division sets up tests in a field in Osceola Mills, Pennsylvania, on June 29.

The explosive tests involve a 1993 Nissan Pathfinder stuffed with 250 pounds of ammonium nitrate and diesel fuel, along with three 25-pound propane tanks and two five-gallon gasoline containers.

These are the same materials allegedly found in the Times Square car bomb.

Taken from various angles, using normal and slow-motion cameras, the FBI video reveals that the explosion would have been quite large – almost certainly enough to kill scores of people in crowded Times Square.

In a memorandum urging a federal judge to sentence Shahzad to life in prison, prosecutors today said Shahzad told the FBI that – had the Times Square bomb been successful – he planned to build and set off another car bomb somewhere in New York City two weeks later. ‘While it is impossible to calculate precisely the impact of Shahzad’s bomb had it detonated, the controlled detonation… demonstrated that those effects would be devastating to the surrounding area,’ the sentencing document said.

Shahzad is set to be sentenced next week.