A rescue operation's underway in southern China, after a ferry sank with more than 450 people on board.

The ship was travelling from Nanjing to the tourist city of Chongqing when it went down in the Yangtze river.

Ten people have reportedly been rescued so far, including the ship's captain and engineer, who said the vessel sank rapidly after being caught in a storm.

Sky's Asia correspondent Mark Stone is in Beijing: