Police are hunting four South Asian men after they attacked two ticket scalpers and robbed them of HK$140,000 (US$17,846) as the scalpers were on their way to pick up concert tickets on Wednesday.

One of the victims, a 33-year-old named Ching from mainland China, said he got to know a woman through Facebook who claimed she had a large number of tickets to see Hong Kong singer Jacky Cheung’s concert, Oriental Daily reported.

They negotiated a price of HK$140,000 for 92 tickets. At 1 am, Ching and his 16-year-old friend carried the cash in a backpack and planned to meet the woman at Nam Cheung MTR station. They were later instructed to go to the open area outside the MTR station’s Exit C, but the woman did not show up.

Suddenly, four South Asian men wearing black clothes and face masks approached and attacked them with iron rods. During the scuffle, one of the men snatched the backpack and jumped in a car and escaped.

The two victims called police. Ching suffered eye and leg injuries and his friend was unhurt. They refused to go to a hospital for medical treatment, claiming they had to work in the mainland in the morning.

Officers searched the area but no one was arrested.

The concert organizer, Universal Music Hong Kong, said all tickets for Cheung’s concerts in Hong Kong were sold out. The company reminded fans not buy forged tickets or tickets for resale at a much higher price.

Cheung’s concert tour started at the Hong Kong Coliseum last Friday and runs to January 29. Tickets for the 15 shows are priced at HK$380 to HK$980. A HK$980 ticket for the last show on January 29 fetched HK$21,499 in an online platform.