Heavy rains on both coasts have killed at least eight people in Mexico, either buried in mudslides or swept away by raging rivers.

Two adults and two children died in Tapachula, a city near the Pacific coast in Chiapas state. They were killed by mud and rocks late Tuesday.

Authorities in Chiapas evacuated 300 families from their homes because of the flooding.

Two people were swept away by overflowing rivers in Veracruz state.

Another two people drowned in the state of Guerrero, where popular tourist resorts such as Acapulco and Ixtapa are located.

Tropical storm Norman rumbled along the west coast, bringing with it heavy rain and winds gusting up to 90 kilometres an hour.

Norman is expected to weaken over the next 24 hours.