MEXICO CITY -- Autopsies indicate an Iowa couple and their two children died from inhaling toxic gas at a rented condo on Mexico's Caribbean coast, but there was no sign of foul play or suicide, Mexican authorities said Saturday.

The prosecutors' office in the Caribbean coast state of Quintana Roo said that "the cause of death was asphyxiation from inhaling toxic gases." It said the type of gas hadn't yet been determined, but added that "any violent act or suicide has been discounted."

Photos released by the office showed investigators in anti-contamination suits and firefighters with air tanks examining gas connections to a stove in the condo in Tulum. The office said investigators "carried out a physical investigation of the gas connections in the room," and the civil defence office of Tulum would issue a technical report on the findings.

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Iowa officials identified the family as Kevin Sharp, 41; his wife, Amy Sharp, 38, and their children Sterling, 12, and Adrianna, 7. They were from Creston, Iowa.

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