At least 122 people have been killed in floods and mudslides in Sri Lanka after the worst torrential rains to hit the tropical island nation since 2003, officials said on Saturday.

The state-run disaster management center said nearly 100 people were still missing, according to Reuters. The early rainy-season downpours forced many families from their homes, displacing over 270,000 people across the country.

Sri Lankan military and rescue teams have used boats and helicopters, but officials said access to some areas was very difficult.