Heavy monsoon rains and flooding in the Indian state of Gujarat over the past three days have killed at least 28 people by drowning or falling trees and evacuated more than 30,000, government officials say.

The Met Office warned of more heavy rain in the western coastal state on Thursday.

The state government said late on Wednesday that 13 people had died by drowning, while others were killed when houses or trees collapsed on them.

Emergency services have rescued 1,856 people and the army has been deployed to help.

Monsoon rains cause widespread destruction every year, but experts say climate change is causing shifts and exacerbating weather-related phenomena.

Last week, floods and landslides in the northeastern Indian state of Tripura killed more than 20 people.