Austrian police who stopped a small truck that appeared overloaded have found 86 refugees crammed inside during sweltering heat.

The Austria Press Agency reported that the truck was halted Saturday at a rest area near the St. Poelten on the A1 highway.

Among the refugees from Afghanistan, Iraq and Pakistan were 16 children and a woman who was eight months pregnant. She was taken to a hospital.

The truck's driver fled and was being sought.

Police say the refugees told them they had been on the road for 12 hours after a long trek on foot but declined to say where the truck journey started. They were being cared for by the Red Cross.

Temperatures in the capital, Vienna, hit 96 degrees Fahrenheit (36 degrees Celsius) on Saturday.