OSAKA -- Yamazaki Baking Co. has retrieved more than 4,100 curry-flavored buns it recalled after convenience stores in Osaka and Hyogo prefectures reported that some of the products appeared to contain mold, officials of the company's factory in Osaka said Saturday.

Yamazaki, Japan's largest bread maker, has taken back 4,169 of about 22,000 buns since Thursday with sell-by dates of Thursday to Saturday, the officials said. All the buns were produced at Yamazaki's Osaka No. 1 factory in Suita, Osaka Prefecture.

Suita public health authorities began investigating the case Saturday, including questioning factory officials.