BEIJING — South Korean media report North Korea's elusive leader Kim Jong Il has arrived in the eastern Chinese city of Nanjing on the fourth day of a secretive visit to his country's key diplomatic ally and source of economic support.

The Yonhap News agency says Kim arrived in the ancient capital on Tuesday after traveling from nearby city Yangzhou where he reportedly visited an industrial park and a shopping center.

Chinese Premier Wen Jiabao has confirmed Kim's visit but no details of his schedule have been announced in keeping with habitual secrecy surrounding Kim's travels.

This is Kim's third trip to China in just over a year, indicating an interest in China's economic reforms amid chronic shortages of food and other basic necessities in the North.