A Macau casino gambler down on his luck was arrested after threatening luckier bettors with a syringe he claimed was filled with HIV-positive blood.

Macau’s Public Security Police (PSP) held a press conference on Monday detailing their arrest of a 27-year-old mainland Chinese tourist who threatened at least three men over a five-day period at unspecified casinos in the ZAPE district earlier this month.

The Macau Daily Times quoted police saying that the suspect had brandished a syringe full of a red liquid he claimed was his own blood. The suspect also claimed to be HIV-positive, and produced a medical report attesting to this claim.

However, once he was in police custody, the suspect admitted that both the report and the blood were fake. The man claimed to have bought the ‘movie blood’ in his native Hebei province, while refusing to indicate where he obtained the bogus medical report. Police are still awaiting test results to learn if the suspect is in fact HIV-positive.