Hong Kong’s secretary for justice has raised concerns that online accusations against the new public prosecutions director may have been based on information that came from inside his department, urging staff to come forward about the source of the allegations.The internal letter from Paul Lam Ting-kwok surfaced on Wednesday after US-based Hong Kong fugitive activist Frances Hui Wing-ting posted it on social media, four days after she cited “insiders among prosecutors” in accusing newly...