An investigation is under way into the brazen killing of Boris Nemtsov, an outspoken critic of Russian President Vladimir Putin. The opposition leader was gunned down as he walked near Kremlin today, hours after denouncing Putin's policies as "mad" on the radio. Vinita Nair reports.
British Intelligence says Mohammad Emwazi, also known as "Jihadi John," has been on their radar since 2009. However, they lost track of him about two years ago. Former FBI executive assistant director and current president of security firm Crowdstrike Services joins "CBS This Morning: Saturday" to tell us more about the challenges of tracking the killer.
The hunt for the Islamic State's frontman killer known as "Jihadi John" continues. British Intelligence officers are reportedly questioning teachers from the killer's former high school after one came forward. Charlie D'Agata reports from London.
High school teacher comes forward with new information on London man identified as ISIS executioner