PITTSBURGH — A clergyman awaiting trial on charges he molested four students some 30 years ago at a school in Australia is the subject of a credible allegation of abuse from when he taught at Pittsburgh’s North Catholic High School, according to a spokesman for the city’s Roman Catholic diocese.

That complaint against Marianist Brother Bernard Hartman, 74, has been turned over to authorities, according to the Rev. Ronald Lengwin.

A former student at the school, since renamed Cardinal Wuerl North Catholic High School, came forward as the diocese was preparing a letter sent to North Catholic alumni last month about the Australian charges.

Hartman is accused of molesting two boys and two girls at St. Paul’s College in Melbourne in the 1970s and early 1980s. One of Hartman’s Australian accusers went public three years ago and authorities there charged him last year.