Slain photojournalist Danish Siddiqui's parents will initiate legal action for an investigation into his killing and to bring to book those responsible, including high-level commanders and leaders of the Taliban.

Siddiqui, 38, was on assignment in Afghanistan when he was killed in July last year. The Pulitzer Prize-winning journalist was covering clashes between Afghan troops and the Taliban in the Spin Boldak district of Kandahar city.