A man has arrested after allegedly triggering a gun scare in a popular entertainment district while wearing a costume for a dress-up party. Jacopo Mastrocinquel, a 35-year-old business owner, was arrested on Monday after he was allegedly spotted carrying a firearm through Moore Park Entertainment Quarter in Sydney. "Two men, aged 39 and 35, were arrested and a replica firearm, a vest, and a badge was seized," police said. Jacopo Mastrocinquel was arrested after carrying an imitation firearm through Moore Park. Two men aged 39 and 35 were arrested carrying a replica firearm, vest and badge at Moore Park Entertainment Quarter.