Emiko Akagi, the wife of one of nine Red Army fugitives wanted in the hijacking of a Japan Airlines jet to North Korea in 1970, used a North Korean diplomatic passport during a trip in Europe in 1988, investigative sources said Wednesday.

Akagi, 46, was arrested Tuesday upon returning to Japan on charges of ignoring a government order, issued in June 1988, to surrender her passport for allegedly working with North Korean agents.

Akagi allegedly used the North Korean passport to travel from Vienna to Zagreb in the former Yugoslavia around June 1988. The Foreign Ministry ordered her to surrender her Japanese passport soon after hearing of her trip.