Late Sunday, hackers gained access to several areas of PBS' web servers and published a fake news story on the PBS NewsHour's news blog, The Rundown, about late rapper Tupac Shakur being spotted alive in New Zealand.

On Tuesday's edition of Frontline, entitled "WikiSecrets," correspondent Martin Smith unravels the mysteries of Bradley Manning, the Army private who allegedly stole thousands of classified government documents and shared them with WikiLeaks. In this excerpt, Frontline reveals the hacker who…

Hari Sreenivasan talks to Frontline producer Martin Smith about the special "WikiSecrets".