Cyber Cell officials of Uttar Pradesh on Tuesday said they have arrested a 26-year-old Ivory Coast national from Delhi for allegedly duping a woman, whom he had befriended on Instagram, of over Rs 28 lakh.The accused and his associates are members of a gang that has duped more than a dozen women of over Rs 2.5 crore in the last two years, the officials said.Ndafirmi was arrested from Delhi on Monday by the officials of the Cyber police station in Noida Sector 36 over a complaint lodged in June last year.