A teenage girl was allegedly raped by a 22-year-old man in UP on Monday while his sister reportedly filmed the crime. Police have registered an FIR against the man while the sister, news reports said, has been accused of abetment. The incident took place in Muzaffarnagar's Civil Lines area. The reports added that police had not yet get hold of the video. According to the reports, the allegations might be the result of another FIR filed the teenage girl's aunt against another woman. The reports said a series of FIRs were filed by two women who used to live together but moved back to their own separate residences after a tiff. One of the women has also alleged that her niece was forced into prostitution.