A Keelung high school on Saturday night apologized for using a picture containing a Chinese flag on the cover of the senior yearbook, adding that it has recalled the books and pledged to provide students new ones before graduation on Thursday.

Of 309 Affiliated Keelung Maritime Senior High School of National Taiwan Ocean University graduates, 248 had purchased the yearbook.

Some students said that the printer committed an outrageous error in including the picture, while others said that nobody would notice such a small flag on the cover.