Islamabad Police Chief Syed Ali Nasir Rizvi told reporters that Sana was killed as a consequence of "multiple refusals" she had made.

Dozens of human right activists held a demonstration in Islamabad on Thursday over the murder of the teenager. A 22-year-old man has been arrested. View on euronews

Authorities say they believe Umar Hayat murdered Ms Yousaf at her home in Islamabad on Monday after she rejected what they called his "offers of friendship". He allegedly also repeatedly tried, and failed, to meet her. They say he broke into her home, fired two shots, stole her phone and fled.