A Texas man was shot and killed in the driveway of his own home Saturday night after returning from the grocery store with his 16-year-old son, investigators said.

The shooting happened around 9 p.m. in the 3300 block on Allington Court in north Harris County, the Harris County Sheriff’s Office said. The man was shot several times and died at the scene before deputies arrived.

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The man’s son had been taking the groceries inside the home when an unknown suspect or suspects drove up in a dark-colored sedan, Sgt. Jason Brown told reporters at the scene.

The son was not injured during the shooting, KHOU-TV reported.

Brown said it was unclear whether the motive was robbery or whether the man had been targeted.

Investigators do not have a clear description of the suspect or suspects, Brown said. Several neighbors who heard the gunshots reported seeing only a dark-colored sedan driving away from the scene.

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The investigation is ongoing.