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

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

It was unclear what caused the collapse or how many people were unaccounted for on Wednesday morning, but authorities said an investigation had been opened. MAP reported that the structures were built in 2006 during a self-construction initiative called “City Without Slums."

Fez is Morocco’s third-largest city and one of the hosts of this m

See Full Page