SEOUL (Reuters) - South Korea expressed regret to Japan on Monday over Tokyo's attitude towards a memorial service held for labourers including Koreans forced to work in Japan's Sado mines during World War Two, Seoul's foreign ministry said.

South Korea commemorated wartime Korean forced laborers at Japan’s Sado gold mines in a ceremony Monday, a day after boycotting a similar event organized by Japan, as tensions over historical atrocities continue to strain relations between the two sides.

Japan has held a memorial ceremony near the Sado Island Gold Mines despite a last-minute boycott of the event by South Korea that highlighted tensions between the neighbors over the brutal wartime use

After boycotting one organised by Tokyo, South Korea held its own memorial event on Monday for compatriots forced to work in a Japanese mine during World War Two, highlighting lingering sensitivities between the countries.

South Korea’s decision not to participate in what was envisioned an a moment of reconciliation highlighted the perceived lack of sincerity in Japan’s treatment of historical issues.

South Korea’s government says it has decided not to attend a memorial service near Japan’s Sado Island Gold Mines due to unspecified disagreements with Japan over the event, which stirred longstanding tensions over the abuse of Korean forced laborers at the site before the end of World War II.

By Jack Kim SEOUL (Reuters) -After boycotting a memorial event organised by Tokyo, South Korea held its own on Monday to remember compatriots forced to work in a Japanese mine during World War Two, highlighting lingering sensitivities between the key U.