At about 21:30 on August 18, after the Shanghai Shenhua vs Beijing Guoan match at Shanghai Stadium, spectators Hua Moumou (male, 36), Jin Moumou (male, 41), and Yin Moumou (male, 51) on the second escalator saw a boy wearing a non‑home team jersey. The three men immediately verbally attacked the boy’s father, using profanity. The incident was captured in a short video that quickly went viral on social media. On August 19, the @Police‑Citizen Direct Channel – Xuhui Station posted a statement that the three men had been detained by police for inciting trouble. Police urged fans to observe civilized viewing and express emotions rationally, and stated that any public disorder or incitement would be strictly prosecuted. The police have detained the three men in accordance with the law.