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Rescuers used dogs to search for survivors and pull people from the rubble. The residential buildings, four to five floors high and set close together, collapsed before dawn in a neighbourhood built in the 1960s and 1970s.
Building collapses and accidents are common in Casablanca and highlight the strain on the infrastructure of one of North Africa's biggest and most densely populated cities.
The state news agency gave no details on the cause of Friday's incident.