'Everything is underwater': Bangladesh flood worsens with millions affected

Flash floods wrought havoc in Bangladesh as the country recovers from weeks of political upheaval, with the death toll rising to 13 and millions more caught in the deluge.

The South Asian nation of 170 million people, criss-crossed by hundreds of rivers, has seen frequent floods in recent decades.

Monsoon rains cause widespread destruction every year, but climate change is shifting weather patterns and increasing the number of extreme weather events.

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"It's a catastrophic situation here," rescue volunteer Zahed Hossain Bhuiya, 35, told AFP from the worst-hit city of Feni. "We are trying to rescue as many people as we can."

Nur Islam, a shopkeeper in Feni, said his home had been completely submerged.

"Everything is underwater," the 60-year-old said.

Much of Bangladesh is made up of deltas where Himalayan rivers, the Ganges and the Brahmaputra, wind towards the sea after coursing through India.

All major tributaries of the two transnational rivers were overflowing, according to local media reports.

In India's hard-hit Tripura state, more than 23 people have died in the floods since Monday.

Bangladesh's disaster management ministry said in a bulletin that its latest toll of 13 deaths included fatalities in cities along the country's southeastern coast.

That included the main port city of Chittagong and Cox's Bazar, the latter a district home to around a million Rohingya refugees from neighbouring Myanmar.

Areas east of the capital Dhaka were also badly hit including the city of Comilla, near the border with Tripura state in India.

Nearly 190,000 others were taken to emergency relief shelters, according to the bulletin, while altogether 4.5 million people had been affected in some way.

The floods come less than three weeks after the ouster of ex-premier Sheikh Hasina, who was forced to flee by helicopter to India, during a student-led uprising.

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