Calgary police are investigating after a woman was found lying dead on a driveway in the southeast community of Cranston on Saturday morning.

Emergency crews arrived at the scene in the 100 block of Cranston Green S.E. around 7:15 a.m. after a resident reported a person in medical distress, said EMS spokesman Stuart Brideaux.

“Crews quickly determined she was deceased,” said Brideaux.

The woman appeared to be around 50 years of age, he added.

A police spokesman said the medical examiner did not indicate a cause of death, so the case is being treated as suspicious until a post mortem can be conducted next week.

“It could be natural causes, but it’s deemed suspicious because we don’t know the cause,” said Acting Det. Martin Taylor.

There did not appear to be any obvious signs of violence or anything untoward, Taylor said.

Police dusted a brown Dodge Ram that was in the driveway for fingerprints, and towed away a black Nissan SUV parked on the street near the body.