China's former security chief Zhou Yongkang has been placed under investigation for "serious disciplinary violation", state media say.
The US accuses Russia of violating a Cold War arms treaty by testing a nuclear cruise missile, saying the breach is "very serious".
Oil giant BP reports a rise in second quarter profits to $3.2bn (£1.9bn), but warns that further economic sanctions against Russia could affect its business.
Jim Reed asks whether passenger planes should fly over conflict zones, after reports that the MH17 plane was 'downed by missile shrapnel'.
Are we asking the right questions about pills designed to improve brainpower? Marek Kohn looks at what they can do for us - and what they can’t.
Although some 50 films are made every week in Nigeria, most go straight to DVD. Now a new digital business model may change the shape of the industry.