Authorities have released a dramatic 911 call capturing the moment a hero father reported a gunman at his daughter’s Oregon school — and then  confronted him.

In the bone-chilling minute-long recording, Kaylub Gianmarco urgently warns a dispatcher that there is “someone with a gun” at his daughter’s school, Silver Trail Elementary, on Oct. 15, according to audio released Tuesday.

.“I have a gun and I swill shoot them right now,” said Giamanco, who was driving home for lunch.

The operator pleads with him to stay put, imploring: “Don’t do anything, let me get an officer there.”

Gianmarco says he will not wait: “I’m about to go kill this kid.”

Moments later, Gianmarco reports that the shooter is breaching the building.

When the dispatcher asks if shots are being fired, Gianmarco says yes.

The operator attempts to press for more details, but the call abruptly cuts off.

Here’s the latest on the elementary school shooting in Oregon:

Gianmarco opened fire and killed Griffin J. John II, 16, who was armed with his mother’s shotgun.

The gunman was able to blast his way through locked doors, where he killed three children and a teacher in a special needs classroom.

One other student was critically wounded and another teacher was injured.

With Post wires.