By Brendan O’Boyle and Lizbeth Diaz

MEXICO CITY (Reuters) -A festive holiday weekend turned tragic for families in northwestern Mexico on Saturday when a deadly blaze engulfed a discount store in the city center of Hermosillo, killing at least 23 people and injuring a dozen.

Mexico is celebrating the Day of the Dead this weekend with colourful festivities in which families honor and remember deceased loved ones.

“I have ordered a thorough and transparent investigation to clarify the causes of the accident,” Alfonso Durazo, governor of the state of Sonora home to the city, said in a video on social media, adding that children were among the victims.

Most of the deaths appeared to have been from inhalation of toxic gases, said Gustavo Salas, the state’s attorney general, citing its foren

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