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Al Jazeera has uncovered evidence of government forces bombing villages surrounding the Yemeni capital, Sanaa.

At least 20 people have been killed and many families forced to live in caves as they fear dying in their homes in the next attack.

Al Jazeera investigates the story just as a UN team begins a 10-day mission in Yemen to investigate claims of human-rights violations since a crackdown began on pro-democracy protesters.

This exclusive report shows bombed villages surrounding Sanaa.

Source: Al Jazeera