BEIJING — Classes have been delayed indefinitely at a Shanghai Catholic seminary caught in the middle of a struggle between Chinese priests and the Communist Party-controlled church over the appointment of a bishop, a staff member and media report said Wednesday.

Classes at the city’s Sheshan seminary usually begin in mid-September but were recently postponed for an unspecified time, said a woman who answered the phone at the school’s administrative office. The reason wasn’t clear, said the woman, who would give only her surname, Lu, because she wasn’t authorized to speak to media.

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