Tropical Storm Otto killed nine people in Costa Rica and forced thousands to evacuate overnight into Friday.
Costa Rican President Luis Guillermo Solis declared three days of mourning, beginning Monday. He said the causalities occurred along Costa Rica's border with Nicaragua.
The storm had been a Category 2 hurricane when it slammed into southeastern Nicaragua on Thursday. Officials there reported no casualties but said homes in low-lying areas had suffered extensive damage.
Otto was losing strength by the time it hit Costa Rica. It has since headed out to the Pacific Ocean.
It should continue to weaken, the U.S. National Hurricane Center said.