Fire sweeps through a garment factory on the outskirts of Bangladesh's capital killing more than 100 people, in the country's worst-ever factory blaze.

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Working conditions at Bangladeshi factories are notoriously poor, with little enforcement of safety laws, and overcrowding and locked fire doors are common.

The blaze at the nine-storey Tazreen Fashion factory in the Ashulia industrial belt of Dhaka started on the ground floor late on Saturday and spread, trapping hundreds of workers. The cause of the fire is not yet known.

"So far, the confirmed death toll is 109, including nine who died by jumping from the building," Mizanur Rahman, deputy director of the fire brigade, told Reuters.

Witnesses said the workers, mostly women, ran for safety as the fire engulfed the plant but were unable to get through narrow exits.

"Many jumped out from the windows and were injured, or died on the spot," Milon, a resident, said.

Most of the bodies were burnt beyond recognition and authorities had started burials while mourning relatives scrambled to find their loved ones, officials and witnesses said.

Bangladesh has around 4,500 garment factories and is the world's biggest exporter of clothing after China, with garments making up 80 per cent of its $24bn annual exports.

This was the highest ever death toll in a Bangladeshi factory fire.

In 2006, 84 people were killed in a blaze in the southern port of Chittagong where fire exits had been blocked.

More than 300 factories near the capital shut for almost a week earlier this year as workers demanded higher wages and better working conditions.

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