Three people are dead after a shooting Monday morning in a Walmart parking lot in Duncan, Okla., authorities said in a statement.

The shooting took place just before 10 a.m., reported the Duncan Banner. Officers with the Duncan Police Department responded to the Walmart Supercenter on Highway 81 in Duncan, a city 65 miles southwest of Oklahoma City.

A man and woman were found dead inside a car in the parking lot, and another man was found dead outside the car, police said in the statement.

It was not immediately clear whether the alleged shooter was among those who died. A handgun was found at the scene, authorities said. The Duncan Banner reported that Red River Technology Center and Duncan Public Schools were put on lockdown.

A news conference is scheduled this morning and authorities are expected to provide more information.

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