A ten-month-old baby and three women died when a boat capsized Monday in the central Bangladeshi district of Shariatpur, police Superintendent Kamrul Ahsan told AFP.

Three more people were electrocuted and died after coming into contact with downed electric cables in separate incidents in the capital Dhaka, officials at Dhaka Medical College Hospital told AFP. No other details were immediately available.

At least eight people died at the weekend in weather related accidents.

Arjumand Habib, deputy director of the Meteorological Department, said a low pressure system causing the rains was expected to affect central Bangladesh including the capital Dhaka at least until late Monday.

It was then expected to move towards Sylhet in the northeast and India's Assam state.

"We expect this situation to continue at least until tonight before the low hits Sylhet and then moves into Assam," she told AFP.

At least a quarter of Dhaka's roads were underwater Monday, city mayor Sadek Hossain Khoka told AFP.

"The infrastructure of Dhaka is not up to coping with this sort of continuous downpour," he said.

"The drainage system is so clogged up with mud and other material like rubbish that the water cannot disperse fast enough."

A tornado lasting five minutes destroyed more than 100 mud-built homes near the port city of Chittagong, officials said.

Some low-lying areas were flooded and cargo loading at the city's port was disrupted, officials added.

Fishermen in the coastal Barisal region were heeding advice not to put out to sea amid strong winds, local officials said.

Earlier, two women and three babies were killed in a landslide at Chittagong caused by incessant rainfall while three people were confirmed dead after a boat sank in the Jamuna river near the northwestern town of Sirajganj.

Around 30 people were still missing Monday. It was not known if they perished or swam ashore and returned home without notifying police.

The rains began Saturday and are not unusual for this time of year.

Monsoon-linked floods across Bangladesh, India and Nepal during July and August destroyed crops and livelihoods, swept away homes, and killed close to 2,000 people.

In Bangladesh, where at least 700 died, some 33 million people were affected and thousands left stranded for weeks. The floods were the worst since 1998 when Bangladesh suffered its worst ever flooding.

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