Seven North Koreans who are in Japan to learn treatment techniques for victims of the 1945 atomic bombings of Hiroshima and Nagasaki paid a visit Friday to the Hiroshima Atomic Bomb Museum.

Ri Myong Guk, leader of the group, said, "I am enraged at how they used science and technology for murderous means. Such a catastrophe as the bombing during the war should not be repeated."

The group arrived in Japan on Tuesday for a weeklong visit to study techniques for caring for North Koreans with ailments related to the atomic bomb attacks. Ri said North Korean doctors have little experience in treating atomic bomb victims.

They had earlier visited a Hiroshima hospital for survivors of the bombs, where Chon Sun Ok, 64, a survivor of the Nagasaki atomic bombing and a member of the North Korean group, will undergo various medical examinations.

The group, which includes two doctors, also paid a courtesy visit to Hiroshima Mayor Tadatoshi Akiba. It is scheduled to visit Hiroshima Gov. Yuzan Fujita after receiving training.

It is the first time doctors from North Korea have visited Japan to study the treatment of A-bomb survivors. The two countries have no diplomatic ties.

During Japan's 1910-1945 colonial rule of the Korean Peninsula, thousands of Koreans were brought to Japan as forced laborers, many of whom worked in Nagasaki and Hiroshima.