In a response to a letter sent to him by the family of Peter Greste, Egypt's interim President Adli Mansour has promised to "spare no effort" in his attempts to secure the release of the Al Jazeera reporter.

Greste, and two other Al Jazeera English staff members, have been locked up in an Egyptian prison for nearly three months.

The Greste family said they saw the president's personal interest in the matter as a positive sign from Cairo, and hoped his release was not far away. 

Al Jazeera's Victoria Gatenby reports.

Source: Al Jazeera