Muhammad Aslam is suspected of shooting the pair, aged 18 and 16, who were his cousins.
The man in the video, the owner of the phone it was filmed on, and relatives of the women are also in custody.

Rights group say violence against women remains a serious problem in Pakistan.

They were murdered last week in the village of Shamplan, in Garyom region on the border of North and South Waziristan tribal districts in Khyber Pakhtunkhwa province.

The area is a socially conservative remote region, where tribal law is often upheld over federal law.

Activists believe about 1,000 such so-called "honour killing" murders - for perceived transgressions of social codes - are carried out across the country every year.

Read MORE

BBC NEWS