He also said four Pakistanis helped Tahir carry out the strike.
"Now it's confirmed that the helicopter was shot down and it was a trap that was set by a Taliban commander," said the official, citing intelligence gathered from the area.
"The Taliban knew which route the helicopter would take," he added.
"That's the only route, so they took position on the either side of the valley on mountains and as the helicopter approached, they attacked it with rockets and other modern weapons. It was brought down by multiple shots."