A 14-year-old girl was gang-raped allegedly by four youths in the Thanga islet of the Loktak lake on Tuesday, police in Bishnupur district said. A manhunt has been launched for the rapists.During preliminary investigation, the girl said a youth had asked her to visit a spot to talk about the photographs he had taken of her from atop a hill. He had threatened to post the photos on social media.When she visited the spot, the youth along with his three friends whisked her away in a van. She was taken to a secluded place where she was raped and left unconscious. That night she took shelter in a house nearby and later filed a police complaint.Talking about action taken against sexual offenders, Chief Minister N. Biren Singh said that after establishing a fast-track court to deal with crimes against women, 11 convicts had been sentenced to long prison terms. In one case, the rapist had been sentenced to life, while his accomplices had been awarded 20-year jail term.