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(WENN) - Former Spice Girls star Melanie Chisholm was plucked to safety from crocodile-infested waters on Tuesday after her boat capsized as she sailed down Africa's Zambezi River.

The singer is taking part in an expedition along the continent's fourth biggest river to raise funds for British charity Comic Relief.

Chisholm and several other celebrities set off on the 68-mile journey over the weekend, and were briefed by experts ahead of their first time battling the river's rapids on Tuesday - but just hours into the challenge Chisholm and her co-rider, comic Jack Dee, got into trouble.

The pair lost control of the raft and the dangerous currents dragged them through trees before the boat capsized and they had to be plucked to safety.

A series of updates on the charity's official Twitter reads:

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