Justice Minister Shozaburo Nakamura called Wednesday on senior public prosecutors from across Japan for swift and rigid action in any criminal liability cases against executives of failed financial institutions.Speedy and strict investigation is also needed for those who obstruct the collection of loans at such financial institutions, Nakamura said at the outset of a two-day meeting of superintending prosecutors at Japan's eight high public prosecutors offices and chief prosecutors from the 50 district public prosecutors offices.With the Diet striving to work out measures on failed and ailing financial institutions groaning under the burden of nonperforming loans, the opposition has demanded that executives' liability for failures should be looked into in the process of disposing of the bad loans.