League of Social Democrats chairman Avery Ng Man-yuen on Friday denied assaulting a police officer with a sandwich that he allegedly aimed at Chief Executive Leung Chun-ying in September last year. The alleged offence took place outside a polling station at Raimondi College in Central during the Legislative Council elections on September 4, when Leung was on his way to cast his vote. The sandwich was said to have struck the officer, Lau Wing-kwan. Ng, 40, pleaded not guilty to one count of common assault before principal magistrate Bina Chainrai in Eastern Court. Prosecutors said they had more than three hours of video evidence, including police footage, a recorded interview with Ng and an identity parade. The case was adjourned to May 5 for a pretrial review. Ng was freed on HK$500 cash bail. Common assault is punishable by up to one year in prison under the Offences Against the Person Ordinance.