The current death toll is nearly four times more than the whole of last year, when Bangladesh recorded 281 dengue-related deaths.

It took six hours for military forces and firefighters to contain the blaze.

As Bangladesh faces worsening climate change impacts on a warming planet, health professionals and organisations in the country are increasingly concerned about deteriorating mental health.

Authorities in Bangladesh and Nepal are scrambling to contain and treat the disease - which is also known as 'breakbone fever' for the severe muscle and joint pains it induces.

Volunteers say eight people were rescued from the boat, which was headed for Malaysia, a coveted destination for thousands of Rohingya Muslims fleeing persecution and poverty in Myanmar and Bangladesh.

BNP activists set fire to buses and exploded petrol bombs, according to police and media.

Hospitals, especially in Dhaka, are struggling to find space for the high caseload of patients suffering high fever, joint pain and vomiting, health officials say.

The cuts - forced by a massive shortfall in funding - have stoked fears of a rise in acute malnutrition and child deaths in the world's largest refugee settlement.

Sreemangal, Bangladesh's tea capital, traditionally has the highest rainfall in the country and temperatures that, while close to 30 degrees Celsius in the summer, feel milder because of the cooling rain.

More than a million Rohingya have been crammed into the camps in southeastern Bangladesh, the world's largest refugee settlement.

This heatwave comes as the country already grapples with power cuts that have hurt its economy in recent months, including its crucial apparel sector that accounts for more than 80% of its exports.

Bangladesh is home to around a million Rohingya, most of whom fled a 2017 military crackdown in neighbouring Myanmar that is now subject to a UN genocide investigation.