A police officer on patrol in Les Cayes said there were no immediate reports of further deaths or damage in the region, which is still reeling from the 7.2 magnitude earthquake on Saturday morning.
Across the seaside city, families were sleeping on mattresses in the streets.
Haitian authorities said late on Wednesday that the official death toll from the quake had risen to 2,189.
The poorest country in the Americas, Haiti is still recovering from a 2010 quake that killed over 200,000.