Officers responding to a report of a suicide attempt found four people dead inside a North Texas home Sunday afternoon, police said.

Crowley Police Chief Luis Soler said in a news conference Sunday night that a 9-year-old who was inside the home called a relative and told her that a man there was injured after attempting to kill himself. The woman then called 911, Soler said.

When police arrived at the home about four minutes after her call, around 4:15 p.m., they found two women, a man and a female child dead, according to Soler.

Officers also found the 9-year-old caller at the scene, apparently physically uninjured, Soler said. That child is in protective custody and is being interviewed.

Soler would only describe the nature of the four dead people's injuries as "trauma."

"We don't know exactly what happened out there," he said, adding that the medical examiner's office was working to determine their identities and causes of death.

The four initially appeared to be "a family unit," but it is not clear exactly how they are related, he said.

He said that officers found no indication of a forced entry and that the initial investigation suggests it was an isolated incident.

The deaths will have "a huge impact in this tight-knit community," the chief said. Crowley, a city of about 13,000, according to its website, is about 15 miles south of Fort Worth.