Dangers in Dhaka, the world's fastest-growing city

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The Bangladeshi capital, Dhaka, is thought to be the world's fastest growing city.

It already has a population of 15m, and an extra 400,000 people move there every year.

This has resulted in a huge construction boom and accelerating property prices.

But there have been a spate of accidents recently. They have highlighted concerns that many of the new buildings may be unsafe, and that the city as a whole is becoming unmanageable.

Mark Dummett reports.