A faulty, gas-powered water heater caused the death of a couple from the United States last month, authorities have confirmed.

The prosecutor’s office in Guanajuato said on Friday that two people on vacation in San Miguel de Allende died of asphyxiation from propane gas.

The victims have been identified as Edward Winders and Barbara Moller, both 76, of New Orleans, Louisiana, who were staying in a rented apartment when a gas leak occurred.

The owner of the apartment notified emergency personnel on November 17 after noticing a strong odor of gas in the vicinity.

It was the second time this year that visitors on vacation in Mexico have died as a result of faulty gas heaters. A couple and their two children died in a condominium in Tulum, Quintana Roo, last March.

Source: Periódico AM (sp), Associated Press (en)