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Authorities are investigating a fire at a North Carolina which killed three people and investigators are calling suspicious.

The fire erupted at around 9 p.m. on Tuesday at a home in Troutman in Iredell County, news outlets reported. When firefighters got to the house, it was engulfed in flames, officials said.

The Iredell County Sheriff’s Office said three people were in the house when the fire broke out and that there was a “domestic situation” hours before the fire, leading an adult son to leave the house. That adult son later appeared at his grandmother’s house in Mooresville, prompting an investigation at that home and where the fire occurred, the sheriff’s office said.

Officials on Wednesday said two people were killed in the fire. On Thursday, they announced that a third body had been found in the home. No names have been released and the cause of the fire has not been determined. Autopsies will be performed on all three victims.

The SBI and Fire Marshal’s Office are investigating the fire.

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