Investigators say the triple drowning Monday afternoon of two young sisters and their teen babysitter at a Pueblo mobile home complex’s swimming pool does not appear to be criminal.

Instead, police have characterized the deaths as a tragic accident.

“They don’t believe this is criminal,” Sgt. Eric Gonzales, a police spokesman, said Tuesday. “But they are still investigating it to cover the bases.”

Authorities identified the three as 3-year-old Azucena Gandarilla, 6-year-old Amaya Gandarilla and 17-year-old Joo Lee. Police say Joo was a “sitter” for the younger girls and that she was watching the pair at the time of the drowning.

“It appears that all three girls accidentally drown(ed) in the swimming pool,” Pueblo County coroner Brian Cotter told The Denver Post. “This will be confirmed at autopsy.”

Officers responding to reports of a drowning at Pueblo Grande Village at 999 Fortino Blvd. found the trio and tried to resuscitate them, but efforts of first responders came too late. Gonzales said the gravity of the situation affected some of those first to arrive on scene.

“It’s very uncommon,” Gonzales said of the drownings. “The fact that it did involve young children and we did have officers trying to perform CPR, it was shocking when they found out these individuals did not survive”

Police say peer support counselors were made available to first responders.

Pueblo Coroner has ID'd the drowning victims from yesterday: Azucena Gandarilla, 3

Amaya Gandarilla, 6 Joo Lee, 17 pic.twitter.com/AWfDD0Ybo8 — Kyla Galer (@kylagalerKKTV) August 9, 2016

On Tuesday morning, officials did not have details on the pool’s depth or size, saying that investigators believe there was not a lifeguard on duty. Police are also looking into whether any of the three lived at the mobile home park.

Related Articles August 8, 2016 Two sisters, teen drown in Pueblo swimming pool

Authorities also are reviewing how long the three were in the water before they were discovered.

“That’s all part of the investigation,” Gonzales said. “They haven’t released any of that information yet.”

Calls to Pueblo Grande Village on Tuesday referred questions about the drownings to their corporate office — Equity Lifestyle Properties — in Illinois.

“We are deeply saddened by this tremendous loss,” the company said in a statement. “The families are in our thoughts and prayers.”