Deaths of 3-Year-Olds Found in Louisiana Truck Were Heat-Related, Police Say

— -- The deaths of 3-year-old twins who were found unresponsive in a pickup truck outside their Louisiana home were "heat-related," according to preliminary findings from their autopsies, police said.

The autopsies for the brother and sister, who died Saturday, were conducted Sunday, and the "heat-related" findings are preliminary, Bossier City police spokesman Mark Natale told ABC News today. The Bossier Parish Coroner's Office declined to comment.

The temperature reached 92 degrees in the area on Saturday.

The incident happened Saturday when the mother, who was home, told neighbors she was looking for her children, twins Oliver and Aria Orr, police said.

The mother and neighbors searched around the home and they then found the children unresponsive in a pickup truck parked outside the house and called 911, police said.

Police and fire crews responded just after 3 p.m. Responders took the children to the hospital, where they were both pronounced dead, police said.

No physical trauma was found on the children, Natale said.

Detectives with the Bossier City police juvenile unit are investigating how the children ended up in the truck, Natale said. No charges have been filed at this time but the investigation is ongoing, Natale said.