Japan mayor regrets South Korea's absence from memorial

Seoul announced Saturday it would not send officials to the mine memorial, after South Korean media criticised the participation of Akiko Ikuina, a parliamentary vice minister at Japan's foreign ministry, citing her past visit to the controversial Yasukuni Shrine.

The shrine is highly sensitive in South Korea due to the enshrinement of Japan's war criminals along with 2.5 million war dead.

Ikuina told Japan's TV Asahi that she has not visited the shrine since she became a lawmaker.

Following the ceremony in Sado, central Japan, Mayor Ryugo Watanabe said the absence of South Korean officials and bereaved families was "extremely regrettable", quoted by Kyodo News.

At the event, Ikuina said "there are many people who perished after coming from the Korean Peninsula during the war to be involved in difficult labor," the Asahi Shimbun daily reported.

Ikuina expressed "our heartfelt condolences to those who passed away," the newspaper said.

The network of mines, which is infamous for using conscripted wartime labor, was added to UNESCO's World Heritage list after South Korea withdrew its objection.

Seoul requested Japan reflect the "full history" of the site, prompting Tokyo to organise the first memorial event to honor the forced labor victims.

After withdrawing from the ceremony, the South Korean foreign ministry said officials will hold a separate memorial Monday at the site where dormitories for Korean laborers were located.