The girls were sitting in a closed car while family members tended to an olive harvest in the village of Tarqumia, Gulf News reported.
Police said there are no criminal charges pending, and the cause of death was determined to be a lack of oxygen.
The girls were identified as Norsin Mohammad Hassan Fataftah, 5, Sarah Zeyad Fataftah, 4, Rama Ahmad Fataftah, 4, Tuqa Zeyad Fataftah, 4 and Nadin Mohammad Hassan Fataftah, 5.
Mohammad Hassan Fataftah said the girls disappeared from the olive trees and family members began searching for them.
The girls were found in the car with the TV on, he said.
Four of the girls were dead upon their arrival to the hospital, while the fifth one died in the ICU.
Couple calls 9-1-1 over missing hash browns; assault McDonanld's employees
Mena Suvari shares her delightfully awkward Christmas card photo