NASHVILLE, Tenn. (AP) – An ambulance has crashed on a Tennessee highway, killing a medic and a patient.

Metro Nashville Police said the single-vehicle crash occurred Friday night on Interstate 40. The patient and a medic in the rear of the vehicle were ejected during the crash.

This is the crash scene on I-40 involving the ambulance. MNPD Crash Unit is leading the investigation. pic.twitter.com/obrNfA7hSc

— Metro Nashville PD (@MNPDNashville) December 1, 2018

Police tweeted that the victims were taken to a hospital in critical condition but later pronounced dead.

It is unclear what caused the crash or why the patient was being transported.

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PHOTO: Metro Nashville Police on Twitter