RABAT, Morocco (AP) — At least 24 workers have been killed in the city of Moroccan city of Tangier after heavy rains flooded a clandestine garment factory, Morocco’s state news agency MAP reported Monday.

Local authorities said firefighters and emergency workers on Monday rescued 10 survivors from the factory, in the basement of a residential villa.

Search operations were still underway to rescue other workers trapped inside the flooded factory.

The total number of workers remains unknown. An investigation has been launched.