RABAT, Morocco — Two adjacent four-story buildings collapsed overnight in the Moroccan city of Fez, killing 22 people in the second fatal collapse there this year, authorities said Wednesday.

Morocco's state news agency, MAP, reported that the two buildings housed eight families. Sixteen people were injured and taken to the hospital. Authorities said the neighborhood had been evacuated and search and rescue efforts continued.

It was unclear what caused the collapse or how many people were unaccounted for. Authorities said an investigation had been opened. MAP reported that the structures were built in 2006 during an initiative called “City Without Slums."

Fez is Morocco’s third-largest city and one of the hosts of this month’s Africa Cup of Nations and the 2030 FIFA World Cup. It is bes

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