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An investigation is underway after the death of 3-year-old twins, one boy and one girl, died in a hot car in Bossier City, Louisiana.

KALB reported that the mother, Alisha Orr, said she laid down and that’s when the twins got out of their home.

“Neighbors tell police the children’s mother, who was home at the time, had contacted them saying she was looking for the children,” according to a statement from the Bossier City Police Department.

Neighbor Rhonda Matthews said Alisha Orr looked in the backyard, and when she found Aria in the car, she screamed. They then found Oliver in the back of the truck.

Police were called to the home after Matthews attempted CPR on both children to no avail.

Authorities said the twins may have been in the car for two or three hours, but there’s no word on how the twins managed to climb inside the truck and close the door.

The Shreveport Times reported that the father of the twins, Travis Orr, is a deputy with the Bossier Parish Sheriff’s Office.

“We are saddened by the tragic loss suffered by the Orr family, and our hearts are heavy,” Bossier Sheriff Julian Whittington said in a statement on Facebook. “This is a very difficult time, but it’s even more so, as they are a part of our Bossier Sheriff’s Office family. Please keep Deputy Travis Orr and his family in your thoughts and prayers.”