/ AP
Anti-Japan protesters burn a rising sun flag of former Imperial Japanese military, during a demonstration in Hong Kong on Saturday, Sept. 18, 2010. Protesters in several cities across China marked a politically sensitive anniversary Saturday with anti-Japan chants and banners, as authorities tried to stop anger over a diplomatic spat between the Asian giants from getting out of control. Ever-present anti-Japanese sentiment in China has been inflamed in recent weeks by Japan's arrest of a Chinese captain after his fishing boat collided with two Japanese coast guard vessels in waters near an island group claimed by both Tokyo and Beijing. Japan has returned the boat and its crew but holds the captain. China has demanded his release. (AP Photo/Kin Cheung)
TOKYO — Japan extended the detention Sunday of a Chinese fishing boat captain arrested over a ship collision near disputed islands, an incident that sparked a diplomatic spat between Tokyo and Beijing and led to scattered nationalist protests in China.