A mother found her 7-month-old baby “unresponsive” after pulling the child from a lake at a park in Australia, leading to a police investigation.

Homicide detectives have launched a probe over the baby’s “unexplained” death, which took place at around 10:40 a.m. local time on Saturday.

Responding to reports of an “unresponsive” infant at a park in Chatsworth, Queensland, emergency services and the Queensland Police found that the baby had drowned, the police detailed in their news release.

“The child was transported to hospital for treatment; however was declared deceased that night,” police said.

An investigation is ongoing. The baby’s mother and father, who have not been named, are co-operating with police.

The Australian Broadcasting Corporation (ABC) notes that homicide detectives are involved in the investigation.

Detective Inspector Craig Mansfield of Wide Bay-Burnett police mentioned, “There’s missing parts leading [up to the death] that we need to try to establish,” according to the report.

“We’ve got some support from the child trauma unit and homicide investigation group working with the local detectives.”

Mansfield added that the baby was with both of his parents for a camping trip at the park, before heading home to North Queensland when “the incident happened the following morning.”

After the baby’s mother pulled him out of the water, “multiple people assisted with CPR,” 9News reports. 

“We’ve had a lot of campers staying there overnight, and we’ve also had a lot of people popping in to use the facilities and the park,” Mansfield said. “We’re aware that some people have left at the time of the drowning of this infant child.” 

He added that other vehicles that were parked in the nearby area are being tracked down and contacted for information, though they are not considered persons of interest.

The child trauma unit and the homicide investigation squad are supporting detectives with their investigation. The incident is not being treated as “suspicious.”

The Post has reached out to Wide Bay-Burnett Police for comment.