"Air support became the key factor in this," the official told AFP by telephone.
"That's what enabled us to restart, with the (Iraqi) ground element, the momentum which has led to this success" against IS jihadists, who had held the city north of Baghdad for almost 10 months.
Iraqi forces still would have been able to retake Tikrit without that air support, "but it would probably have taken a little longer," the official said.
They recaptured nearby towns and were able to surround the city within two weeks, when the campaign stalled, with commanders saying the halt was an effort to avoid casualties and damage to infrastructure.
Iran was Baghdad's main foreign partner for much of the operation, but Iraq eventually requested coalition air strikes, which began on March 25.
The coalition announced it carried out more than three dozen strikes until the city was retaken.
That prompted a backlash among key militia groups, with commanders saying they were halting offensive operations in response to the strikes -- an outcome the coalition wanted anyway.
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