Hong Kong police fire tear gas at unauthorised protest

There have been more clashes in Hong Kong where thousands have defied a police ban to demonstrate in the town where pro-democracy activists were attacked by a mob.

Also in the programme: Iraq unearths mass graves believed to contain Kurds slain in 1988 by Saddam Hussein, we hear from one of the survivors of the Anfal massacre; and an exhibition in London reveals the secrets of a century of spying.

(Photo: Police fired tear gas in an attempt to disperse the protesters. Credit: Reuters)