Obama sees no security threat from sex scandal

US President Barack Obama assured citizens on Wednesday that the sex scandal that brought down CIA chief David Petraeus and ensnared another top general has not compromised national security.

Petraeus - the most celebrated US general of his generation, who was credited with turning around the war in Iraq - resigned last week to pre-empt revelations of an affair with his biographer Paula Broadwell, a married army reservist.

A lawyer acting for the US commander in Afghanistan, General John Allen, who is also under investigation over e-mails he sent to a Florida socialite, said his client would fully cooperate with the Pentagon probe.