UPDATED: May 31, 2019  5:05 PM

UPDATE: On Friday, the two women who died were identified as Myriah Annelouise Norris, 32 and Brittany Ann English, 33.

The official cause of death is pending.

DALLAS (CBSDFW.COM) – Dallas Police confirm two women and a dog were found dead in an apartment unit in the 17000 block of Vail Street in North Dallas at the Aster by Cortland Apartments.

Police are categorizing the situation as unexplained deaths at this point.

Dallas Fire-Rescue said before first responders arrived, maintenance workers forced their way into the locked apartment and found the victims.

Dallas Fire-Rescue’s hazardous materials team was called in due to carbon monoxide being detected.

Though they confirmed the presence of the gas, they were unable to identify an exact source.

Apartment complex off Vail St. in North Dallas (Chopper 11)

Neighbors told CBS 11 the apartment unit where the deaths happened is above a boiler room.

Management at the apartment complex had no comment on what happened.