A large quantity of hashish was found in the private ambulance, officials said.
They said the ambulance was carrying a coronavirus patient of Nushki along with his son and two other relatives to Karachi for treatment when it collided with the Quetta-bound coach near Khad Kocha area of Mastung district.
Levies and FC personnel rushed to the site and shifted the bodies and the injured to nearby hospitals, including the ambulance driver.
However, when the FC personnel were removing the ambulance from the main road 135kg of hashish was found in it.
“Hashish was packed in parcels weighing one kilogram which were concealed on the roof of the ambulance,” a senior official of the Mastung administration said, adding that an investigation had been launched into the matter.