Hong Kong student leaders denied Beijing flight

Three pro-democracy student leaders from Hong Kong have been stopped from boarding a plane to Beijing.

They had hoped to meet China's leaders as part of their push for greater democracy, but were told at the airport that their travel permits were invalid.

Protesters have been camped out on the streets of Hong Kong since late September.

They want Beijing to allow more candidates to stand in the territory's next leadership election in 2017.

John Sudworth reports.