Authorities in Detroit have revealed the cause of death for two children who died after sleeping in a van amid freezing temperatures.

Autopsy results released Wednesday reveal Darnell Currie Jr. and his sister, A'Millah, died of carbon monoxide poisoning, not hypothermia.

The cause of death of two young children who were sleeping in their family's van was revealed to be carbon monoxide poisoning and not exposure to the cold as Detroit authorities first thought.

Autopsies show two Detroit children who died in a van in below-freezing temperatures were victims of carbon monoxide, not exposure to cold weather.

The Wayne County Medical Examiner's Office released the official cause of death of two children who died while sleeping in a van with family in Detroit.

DETROIT, MI – The Wayne County Medical Examiner’s Office determined the two children found not breathing in a minivan outside Detroit’s Greektown Casino died of carbon monoxide poisoning, Fox 2 Detroit reports. Police originally thought the two children, Darnell Currie Jr., 9, and A’millah Currie, 2, froze to death on Feb. 10.

On Feb. 10, the children's family was parked at the Hollywood Casino at Greektown when their car stopped running in the middle of the night, officials have previously said. Darnell Currie Jr. and A'millah Currie later stopped breathing and died.

The Wayne County Medical Examiner’s Office has determined the cause of death for the two children who died in the parking garage of a Detroit casino.

A small pink casket rested next to a larger blue one at a Detroit church as hundreds of mourners gathered Thursday to say goodbye to two children who tragically died last week amid frigid temperatures while sheltering in a van with their mother.

The two Detroit children originally believed to have frozen to death while sleeping with their family in a van at a casino parking structure last month were actually killed by carbon monoxide poisoning.