Police and fire officials responded to the home near West Augusta Avenue in Phoenix, Arizona around 8 a.m. on a report of a possible hazardous materials investigation and an unresponsive person inside, and they detected natural gas.

There were two adults and three children were found dead in the home with obvious signs of trauma.

Police have not determined whether it was a murder or suicide case.

Southwest gas turned off the gas to the home out of caution, police said. It was not clear where the gas had come from or how.

The names and ages of the family that died were not immediately released, but CBS news spoke with the family’s cleaning ladies who said the couple who lived at the home had 6-month-old twin girls and a 3-year-old boy.