Twenty people were killed, and 16 others were injured as two adjacent four-story buildings collapsed overnight in the Moroccan city of Fez in the second fatal collapse there this year, authorities said Wednesday.

The collapse of two buildings in the northern Moroccan city of Fes, authorities said Wednesday, was reportedly the deadliest accident of its kind in the kingdom in recent years.

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 w

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