Danish television viewers will soon watch the desperate story of a Turkish father searching for his two lost daughters, who left their family to join the Daesh terror group.

The two girls named Leyla and Hazal Olgun left their family's home in Denmark's eastern neighborhood of Brøndby Strand near Copenhagen last year on May 26, saying that they were going "somewhere for the weekend."

Following their departure, father Yaşar Olgun realized that his daughters had actually left to join Daesh, and he conducted a broad research with his own means, discovering that the girls were in Turkey.

Olgun's journey around the streets of Istanbul in search of his daughters caught the attention of Denmark's publicly owned television station TV 2.

TV 2 turned the father's search and experiences into a documentary called "From Brøndby Strand to the Caliphate," which will air on Thursday at 20:00 p.m. local time.

In an interview last December, Olgun said that Turkish police had helped him a lot during his time in Istanbul, adding that he still believed that his daughters were in the densely populated city.

Olgun also called for other Danish families, who had lost their children to Daesh, to act together in their search.

Hundreds of families in Europe share the same fate as Yaşar Olgun, as more and more young, easily-influenced people are tricked by Daesh recruiters mostly via online chat rooms.