Kamrul Islam, prime accused in Sylhet teenager Rajan murder case who was arrested in Saudi Arabia, has been brought to Dhaka.A flight of Biman Bangladesh Airlines carrying Kamrul landed at Hazrat Shahjalal International Airport in Dhaka at 2:57pm, said Alamgir Hossain, senior assistant superintendent of Armed Police Battalion.Kamrul fled to Saudi Arabia after allegedly torturing 13-year-old Rajan to death at Kumargaon on July 8.