Source:
Guardian UKAndy Coulson investigated for perjury while working at No 10
Sources say police will examine Coulson's denial of any knowledge of phone hacking at Tommy Sheridan trial
Andy Coulson, the prime minister's former director of communications, is being investigated by police for allegedly committing perjury while working for David Cameron in Downing Street.
The development renews pressure on the prime minister over his judgment in hiring the former News of the World editor and represents the third criminal investigation Coulson faces, adding to allegations that he knew of phone hacking while in charge of the tabloid and authorised bribes to police officers.
Strathclyde detectives confirmed that they had opened a perjury inquiry centred on evidence Coulson gave in court last year that led to a man being jailed.
Coulson was a major witness in a trial involving Tommy Sheridan, the former MSP who was accused of lying in court when winning a libel action against the News of the World. Coulson had been the editor of the Sunday tabloid when it ran a story accusing Sheridan of being an adulterer who visited swingers' clubs.
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http://www.guardian.co.uk/media/2011/jul/22/andy-coulson-investigated-perjury-allegations