At least five people died on May 26 as howling winds and waves the height of double-decker buses belted eastern India in the Covid-stricken country’s second cyclone in as many weeks.

Cyclones are a regular menace in the northern Indian Ocean but many scientists say they are becoming more frequent and severe as climate change warms the waters of the Bay of Bengal and Arabian Sea.

Barely a week after Cyclone Tauktae claimed at least 155 lives in western India, Cyclone Yaas has forced the evacuation of more than 1.5 million people in the eastern states of West Bengal and Odisha.

West Bengal chief minister Mamata Banerjee said that the seaside town of Digha had been “swamped” by waves up to 4m high.

She said two people had been killed, including one dragged into the sea by the waves in Digha and another crushed when his house collapsed.

The storm packed lashing rain and winds gusting up to 155km/h, the equivalent of a category two hurricane.

Nearly 20,000 houses were damaged and more than a dozen river islands were flooded, with a number of embankments breached, Banerjee said.

In Odisha, a young man and a priest were killed in separate incidents after they were crushed by falling trees.

There was extensive damage with hundreds of trees uprooted, some bringing down power lines, relief official Pradeep Kumar Jena said. Some thatched homes were also damaged during the storm, but telecommunication networks were not affected, he added.

The state’s chief minister Naveen Patnaik said aid would be provided to more than 100 villages cut off by the tidal surge.

In neighbouring Bangladesh, one man was killed by a falling tree as the waves smashed through water defences and inundated thousands of homes, officials told reporters.

The Bangladesh military added that 12 crew on board a cargo ship carrying stones in the Bay of Bengal were rescued after it sank amid the extreme conditions.

Locals feared the situation would worsen in the evening as the tide rises to a higher level than normal because of a full moon.

Almost 5,000 disaster workers were deployed in India with tree and wire cutters, emergency communications, inflatable boats and medical aid, the National Disaster Response Force said.

Officials fear the storm will further complicate efforts to halt a surge in coronavirus cases that has now killed 310,000 people in the country.

Masks were distributed in emergency shelters, but West Bengal state minister Bankim Chandra Hazra told AFP that maintaining social distancing would be “a big challenge”.

“This cyclone spells double trouble for millions of people in India as there is no respite from Covid-19,” said Udaya Regmi from the International Federation of Red Cross and Red Crescent Societies.

Some vaccination centres in threatened districts, as well as Kolkata, suspended operations and a special effort had been launched to ensure the supply of oxygen and medicines to hospitals, officials said.