Islamabad, Nov 3 (IANS) A chilling video shows three trained Pakistani Taliban terrorists filming a heavily guarded CID office in Karachi before carrying out a deadly suicide attack last year.

The nearly 15-minute video was posted a year after the attack that left over 20 people dead.

The men — identified as Rahmanullah, Farmanullah and Khan Mohammad — gave interviews before carrying out the fidayeen attack, the video shows, reported Dawn.

It was produced by Umar Studio, said to be the media wing of the banned Tehreek-i-Taliban Pakistan.

The video shows the men undergoing arms training at an unknown location. It then shows the filming of the target building and the explosives-laden mini truck.

The men said in Pushto that they had not been forced to commit suicide and that they had chosen to die.