Police are looking into the identity of the source.
Tips
usage
Built on 爆料 ('to drop a bombshell', literally 'explode the material'), which CC-CEDICT defines as 'to make explosive allegations'. Add 人 for the person doing it. Shows up constantly in entertainment news headlines and corporate-scandal coverage.
register
Neutral-to-slightly-tabloid register. A serious whistleblower investigation might use 举报人 or 揭发者 instead — 爆料人 has more of an Us Weekly / 狗仔 feel.
