Three persons have been arrested by the Kollupitiya Police in connection with the arson attack on Prime Minister Ranil Wickramasinghe's private house in Colombo last night. Among those arrested include a 19-year-old Mount Lavinia resident and two residents of Galle, aged 24 and 28 respectively, web portal Colombo Page reported, quoting the Police Spokesman SSP Nihal Talduwa.