New Delhi: Congress President Sonia Gandhi has written to Prime Minister Manmohan Singh over the suspension of IAS officer Durga Shakti Nagpal, saying the officer must not be "unfairly treated".PromotedListen to the latest songs, only on JioSaavn.comHere is the full letter:Also Read"Some Progress": Benjamin Netanyahu On Gaza Hostage, Ceasefire TalksParliament Winter Session Highlights: "Our Constitutional Amendments Not Done To Further Grip On Power," Says PMWho is Francois Bayrou, France's Fourth Prime Minister In 12 Months