A group of South Korean labor unionists were found to have visited a national cemetery in Pyongyang that Seoul declared as an off-limits site.

The government said Thursday that around 50 of a five-hundred-member-delegation visited the Cemetery of Revolutionary Patriots during the joint May Labor Day celebrations that ran from April 30th through May 3rd.

Following the confirmation, the Unification Ministry cut its financial support for the May event to around 69 million won from some one-hundred million won.

The ministry also imposed a one-month travel ban on four activists that personally paid their respects at the cemetery as well as ten other officials of the Korean Confederation of Trade Unions and the Federation of Korean Trade Unions for failing to prevent the visit.

Located in Pyongyang, the cemetery houses the tombs of one-hundred-20 North Korea's first-generation leaders, including North Korean leader Kim Jong-il’s mother Kim Jong-suk.

The government currently prohibits South Koreans from visiting a number of places believed to uphold the North's communist ideology, including the Geumsusan Memorial Palace in Pyongyang, where the North's late founder Kim Il-sung's body lies in state.

The North, on its part, has called on Seoul to remove its travel ban on places declared off-limits by the South's National Security Law.