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After his arrest, the Pakistani American had claimed that he had met Mehsud and a host of other radical leaders, but investigators had then said they were yet to verify his claims. The video that has now emerged shows a man who appears to be Shahzad shaking hands with Mehsud and then embracing him.
The footage, which is available on the Sky News website, features an audio track of Shahzad saying, "Today, along with the leader of Tehrik-e-Taliban Pakistan Hakimullah Mehsud and under the command of Amir al-Mumineen Mullah Mohammed Omar Mujahid (may Allah protect him), we are planning to wage an attack on your side, inshallah".
In June, Shahzad pleaded guilty to trying to detonate a car bomb hidden in a Nissan Pathfinder in a crowded area of Times Square on May 1.
"I want to plead guilty, and I'm going to plead guilty 100 times over because until the hour the United States pulls its forces from Iraq and Afghanistan, and stops the drone strikes in Somalia and Yemen and in Pakistan, and stops the occupation of Muslim lands, and stops killing the Muslims, and stops reporting the Muslims to its government, we will be attacking US, and I plead guilty to that," he said in the courtroom.
During the trial, Shahzad admitted that he had traveled to Pakistan to receive training from the Taliban and described himself as "part of the answer to the US terrorising Muslim nations and Muslim people".
The US authorities had suspected the hand of the Pakistani-Taliban in the attack since the beginning of the investigation. Shahzad said that after becoming a US citizen last year, he went back to Pakistan in June to first meet his family and then headed to Peshawar, where he received bomb training from the Tehrik-i-Taliban.
"One has to understand where I'm coming from. I consider myself a Muslim soldier," he told the judge.
Shahzad admitted building three explosive devices in his home in Connecticut and said that he did not know why they did not explode. Since then, it has been established that the cheap quality of explosive material Shahzad bought had ruined his plan.
If the terror plot had been successful, it would have killed thousands of people. The father of two children worked as a financial analyst in Connecticut where he lived with his wife. He will be sentenced on October 5.