At least 13 people died and tens of thousands evacuated in one of the worst floods in decades to batter southern Thailand and northern Malaysia.

Floods in northern Malaysia and southern Thailand have claimed the lives of at least 12 people, and 135,000 individuals have been forced to leave their homes. Authorities warn that the number of casualties may increase.

KUALA LUMPUR - Flooding in Malaysia has claimed six lives as of Monday, with the latest deaths being two elderly individuals drowning in Kelantan state while monitoring livestock, authorities said. Flood victims numbering 134,524 are being housed in 613 flood relief centers at 11 am local time, according to the country's social welfare department.

KUALA LUMPUR/BANGKOK (Reuters) -- Malaysia and Thailand are facing a second wave of heavy rain and potential flooding this week, authorities said on Monday, even as some displaced residents were able to return home and the worst floods in decades began receding in some areas.

Malaysia prepared for its worst floods in a decade after heavier-than-expected monsoon rains caused severe flooding that killed three people and displaced more than 80,000

There are worries in Malaysia and neighbouring Thailand that disastrous flooding could get worse as more rain comes.

The death toll from the worst floods in decades in southern Thailand and northern Malaysia climbed to at least 12 on Saturday, authorities said, as tens of thousands of people were evacuated due to rising water levels in the past three days.

Floods in northern Malaysia and southern Thailand have killed at least 12 people, and 135,000 residents have had to leave their homes. Authorities warn that the number of casualties may rise. In Malaysia,