Hawaii island police said today they are investigating a possible drowning in the Puna district.

At 4 p.m. Tuesday, police received a report of an unresponsive woman who had been snorkeling at Pohoiki Beach.

When police arrived at the scene, lifeguards and Fire Department rescue personnel were attempting cardio-pulmonary resuscitation on the woman. Attempts to resuscitate the victim at the scene were unsuccessful, police said.

The identity of the victim is being withheld pending notification of her family.

Police have initiated a coroner’s inquest investigation and have ordered an autopsy to determine the exact cause of death.