SAN SALVADOR: Tropical Storm Amanda triggered flash floods, landslides and power outages as it barrelled through El Salvador and Guatemala Sunday, killing 14 people, authorities said, warning of further heavy rain to come.

El Salvador President Nayib Bukele declared a 15-day state of emergency to cope with the effects of the storm, which he estimated to have caused $200 million in damage, but which weakened later in the day as it moved into Guatemala.

Amanda, the first named storm of the season in the Pacific, unleashed torrents of floodwater that tossed vehicles around like toys and damaged about 200 homes, the head of the Civil Protection Service William Hernandez said.

The fatalities were all recorded in El Salvador, Interior Minister Mario Duran said, warning that the death toll could rise.

One person is still missing, senior government official Carolina Recinos added.

"We are experiencing an unprecedented situation: one top-level emergency on top of another serious one," San Salvador mayor Ernesto Muyshondt said, referring to the coronavirus pandemic.

He added that half of those killed died in the capital, and that 4,200 people had sought refuge in government-run shelters after losing their homes or being forced to leave because they were in high-risk areas.

In some flooded areas, soldiers worked alongside emergency personnel to rescue people.