"We've yet to determine whether anything occurred here that could warrant criminal charges," a police spokesman tells PEOPLE

By Chris Harris
Updated June 21, 2016 09:00 AM

Police in Louisiana are investigating the circumstances surrounding the deaths of 3-year-old siblings who were found unresponsive on Saturday afternoon inside the sweltering cab of a pickup truck, PEOPLE confirms.

A statement from the Bossier City Police Department says detectives are investigating the deaths of the boy and girl, who were twins.

Police say the children’s mother enlisted help from her neighbors to find the two 3-year-olds, who had gone missing. When a neighbor located the brother and sister inside the truck at around 3 p.m., both children were not conscious or moving.

The truck was parked in the Orr family home’s driveway, according to investigators.

Autopsies on the twins, identified as Oliver and Aria Orr, has revealed their deaths were heat-related, a police spokesman tells PEOPLE.

No criminal charges have been filed against the children’s mother or their father, Travis Orr, who works as a deputy with the Bossier Parish Sheriff’s Office.

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“Our investigation will focus on how the kids ended up in the pickup truck, and whether it was due to someone’s actions or was accidental,” the spokesman says. “We’ve yet to determine whether anything occurred here that could warrant criminal charges.”

The twins’ deaths come just three weeks after Oliver was released from the hospital after suffering a near-fatal injury, according to police. The boy was in the hospital for over about a week for treatment of unspecified injuries.

According to the Shreveport Times, the parents of the twins had lived in the neighborhood for more than nine years.

Neighbor Rhonda Matthews told the paper, “They were wonderful, happy kids,” adding, “They are good people, and they were good parents.”