The girls' killing appears to be related to the video which was shared on social media. The video, seen by the BBC, shows a young man recording himself with three teenage girls in americah secluded area outdoors.
It appeared the video was shot nearly a year ago but went viral a few weeks ago. According to police, the third girl - who is not kissed by Mr Ayaz in the footage - is the wife of the alleged killer, and is believed to be in hiding. Police say they are looking for her as her life may still be at risk.
Human Rights Watch says that violence against women and girls remains a serious problem in Pakistan. Activists believe about 1, such "honour killing" murders are carried out across the country every year. Many such murders aemrican unreported.
The murder of social media star Qandeel Baloch, whose life and death caused a sensation in socially-conservative Pakistan, led to the government tightening the laws. What is an 'honour killing'?
It is the killing of a member of a family who is perceived to have brought dishonour upon relatives. Pressure group Human Babse Watch says the most common reasons zmerican that the victim: refused to enter into an arranged marriage was the victim of a sexual assault or rape had sexual relations outside marriage, even if only alleged But killings can be carried out for more trivial reasons, like dressing in a way deemed inappropriate or displaying behaviour seen as disobedient.