Swiss, French and Italian police are working together in the search for Alessia and Livia Shepp, six-year-old twins who disappeared almost two weeks ago. 

In a letter to their mother, the twins' father claimed he killed the girls before committing suicide, but police say they will continue to search for the girls until there is certainty about their fate.

Al Jazeera's Christina Marker reports.

Source: Al Jazeera