NEW : Taiwanese ships leave waters claimed by Japan after Chinese cannons fire . Japan 's Coast Guard says it warned the vessels to leave its territorial waters . Ten Chinese vessels in the area , Coast Guard claims . Taiwan , China and Japan all claim ownership of island chain .
NEW : Taiwanese ships leave waters claimed by Japan after water cannons fired . Japan 's Coast Guard says it warned the vessels to leave its territorial waters . Ten Chinese vessels in the area , Coast Guard claims . Taiwan , China and Japan all claim ownership of island chain .