A Creston, Iowa couple and their two children died from inhaling toxic gas while vacationing in Mexico, local authorities said.
The bodies of Kevin Sharp, his wife Amy and their two children, 12 year old Sterling and seven year old Adrianna were discovered Friday at a rental condominium in the beach town of Tulum.
The family had been dead for about 36 to 48 hours, according to Quintana Roo prosecutors office. Autopsies showed they suffocated after inhaling toxic gases, but it's unclear what type of gas led to their deaths, the prosecutor's office said.
There were no signs of foul play or suicide, officials said. Investigators ruled out a possible robbery because they did not see evidence of a disturbance inside the condo. Photos released by Mexican officials show crews and firefighters wearing masks while checking a gas stove in the condo.
They performed "physical inspection of the room's gas installation" and are expected to release a technical report at a later date.