Twelve of the 14 residents’ deaths at a Hollywood, FL, nursing home following Hurricane Irma have been ruled homicides, authorities revealed last week.

Autopsy reports released Wednesday by the Broward County Medical Examiner’s office deemed the deaths as homicides caused by environmental heat exposure, according to local reports. The deaths of two other residents were not related to the Rehabilitation Center at Hollywood Hills losing power to its air conditioning system following the storm, authorities said.

An investigation into the deaths is ongoing, and will determine if anyone will be charged in connection to the deaths, the Miami Herald reported. As of production deadline no arrests had been made.

In addition to a criminal investigation several lawsuits have been filed by residents’ families against the now-shuttered long-term care facility. An attorney for Hollywood HIlls told Congress last week that lawmakers investigating the deaths should “resist the urge to vilify or demonize” staff of the facility.