Cyclone Mahasen has begun crossing Bangladesh's southern coast, as people packed into evacuation shelters.
A tropical storm has lashed coastal areas of Bangladesh, killing 12 people, destroying thousands of huts and forcing up to a million people to flee.
The storm hit Patuakhali district on Thursday with winds of up to 100km/h (60mph), and was heading for the ports of Chittagong and Cox's Bazar.
Officials had prepared for a cyclone, but the storm, called Mahasen, weakened considerably before making landfall.
At least 12 people have been killed, Bangladeshi officials say.
The storm hit Patuakhali district on Thursday with heavy rain and wind of up to 100km/h (60mph).
Around one million people have been ordered to evacuate low-lying areas in Bangladesh and Burma, and take shelter in cyclone centres.
Early reports suggest Muslim Rohingya living in camps on both sides of the Burma border were spared the worst.
Displaced Rohingya Muslims, living in camps on both sides of the border, may be particularly vulnerable.
The United Nations had warned that 8.2 million people were at risk from Mahasen in Bangladesh, Burma and north-east India.
But some of those on the Burmese side have resisted calls for them to evacuate camps in Rakhine state.
Several Indian states issued storm alerts and warned people to take precautions against severe weather conditions.
The United Nations has warned that 8.2 million people could be at risk from Mahasen in Bangladesh, Burma and north-east India.
The storm weakened over the Bay of Bengal, however, and forecasters say it is likely to dissipate within 24 hours.
Several Indian states have issued storm alerts and warned people to take precautions against severe weather conditions.
Centres crowded
Centres crowded
At least 956,672 people have been evacuated from Bangladesh's coastal areas to more than 3,200 cyclone shelters, the government said on Thursday.
The Bangladeshi government said it had evacuated 956,672 people from coastal areas to more than 3,200 cyclone shelters.
The measures in place are a sign of the preparation the authorities have made for the storm, the BBC's Sanjoy Majumder, in the city of Chittagong, reports.
Officials broadcast warning messages before Mahasen hit.
Warning messages went out to the population across all media before Mahasen hit.
Airports in Chittagong and the resort town of Cox's Bazar were closed, and Chittagong's port also remains closed, says the BBC's Sanjoy Majumder in Chittagong.
Airports in Chittagong and the resort town of Cox's Bazar have been shut until the danger subsides. Chittagong's port, the busiest in Bangladesh, also remains closed, our correspondent says.
The Bangladeshi authorities earlier raised the danger level to seven out of 10 for low-lying areas around Chittagong and Cox's Bazar.
The Bangladeshi authorities earlier raised the danger level to seven out of 10 for low-lying areas around Chittagong and Cox's Bazar.
The cyclone covered more than 175km in nine hours before hitting Bangladesh, the country's Meteorological Department said.
The cyclone covered more than 175km in nine hours before hitting the coast, Bangladesh's Meteorological Department said.
However, the service's deputy director, Shamsuddun Ahmed, told AFP news agency the cyclone was not expected to cause serious damage as it was "not severe".
A storm surge destroyed thousands of huts and caused flooding in coastal areas.
The cyclone "did not gain strength in the last part of its journey as it hit the coast", he said.
All schools, colleges and some hotels have been declared cyclone shelters, and most were packed overnight.
In Bangladesh, there have been reports of waist-deep water submerging low-lying areas and houses being damaged. Dozens of huts collapsed when the cyclone struck Patuakhali district, eye witnesses told local media.
There are also fears of a storm sea surge, and authorities have warned that heavy rainfall could cause landslides in hilly regions.
All schools, colleges and some hotels have been declared cyclone shelters, the BBC's Mir Sabbir reports from Dhaka. The centres are crowded and people are still rushing in, our correspondent adds.
'Race against time'
'Race against time'
In Burma, meanwhile, tens of thousands of Rohingya Muslims living in camps in low-lying areas of Rakhine state are feared to be at risk.
In Burma, there were fears for tens of thousands of Rohingya Muslims living in camps in low-lying areas of Rakhine state.
They were displaced by ethnic violence last year and many are reluctant to move from the camps.
They were displaced by ethnic violence last year and many were reluctant to move from the camps.
Hla Maung said he lost his mother and two young daughters during the clashes between Muslims and Buddhists.
One refugee, Hla Maung, said he had lost his mother and two young daughters during the clashes between Muslims and Buddhists last year, and would not move from the camp.
"I lost everything. I don't want to go anywhere. I'll stay here. If I die, I want to die here," he said.
"I lost everything. I don't want to go anywhere. I'll stay here. If I die, I want to die here," he said.
Rakhine state said it had moved some 36,000 internally displaced people (IDPs) from camps, Kirsten Mildren, from the UN Office for the Co-ordination of Humanitarian Affairs (Ocha), told the BBC.
Burmese Planning Minister Tin Naing Thein said that in all, more than 166,000 people had been relocated.
But she said the evacuation was "not moving as fast as we'd like - it's certainly a race against time. We're finding it very difficult to convince [people] to move to higher ground or safer buildings".
In the event, the storm changed course and appears to have caused only minor damage in Burma.
Burmese planning minister Tin Naing Thein said that in all more than 166,000 people had been relocated, but there was little evidence of a mass evacuation in reports from the affected area.
Cyclone Mahasen earlier hit Sri Lanka, causing floods and mudslides that killed at least seven people, according to the country's Disaster Management Centre.
Correspondents say the Burmese evacuations are seen as a test of the government's resolve to assist the Rohingya, amid allegations that state forces stood by or even participated in last year's anti-Muslim violence.
Cyclone Mahasen has already taken a toll. Though the storm did not make landfall in Sri Lanka, the associated heavy rain caused floods and mudslides which killed at least seven people, according to the country's Disaster Management Centre.
At least 50 Rohingya Muslims drowned on Tuesday when boats evacuating them from the path of the cyclone capsized off western Burma.
At least 50 Rohingya Muslims drowned on Tuesday when boats evacuating them from the path of the cyclone capsized off western Burma.
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