Police said the accused managed to record an objectionable video of a ninth class student in Dunyapur area of Lodhran. Later, they continued to blackmail and sexually assaulted her for six months.
They also demanded Rs300,000 from the father of girl for the video and uploaded it on the internet after their demand was not met.
Police, on the complaint of father of ill-fated girl, arrested main accused identified as Inzamam, Ahtasham, Jahangir and Sheeraz and recovered the objectionable video.
Police have registered case under 376 and 292 of the law.