David Cameron's former communications chief Andy Coulson has been arrested and charged with perjury.
The former News of the World editor was earlier detained for questioning at Govan Police Station in Glasgow by officers from Strathclyde Police. The force said a report will be submitted to the Procurator Fiscal which will decide whether Mr Coulson is to face court proceedings.
Coulson was detained in London on Wednesday morning by Strathclyde Police and arrived at Govan Police Station in the south side of Glasgow in the afternoon.
The 44-year-old gave evidence in Sheridan's perjury trial at the High Court in Glasgow in December 2010.
Operation Rubicon detectives have been looking at whether certain witnesses lied to the court during Sheridan's trial as part of a "full" investigation into phone hacking in Scotland.
Sheridan was ultimately jailed for three years in January last year after being found guilty of perjury during his 2006 defamation action against the News of the World.
He had been awarded £200,000 in damages after winning the civil case but a jury at the High Court in Glasgow found him guilty of lying about the now-defunct tabloid's claims that he was an adulterer who visited a swingers' club.
The trial, which lasted almost 12 weeks, was one of the longest of its kind in Scottish legal history.
The former Scottish Socialist Party (SSP) leader represented himself after parting company with QC Maggie Scott. He was convicted of five out of six allegations in a single charge of perjury relating to his evidence during the civil action at the Court of Session in Edinburgh.
His wife Gail was on trial along with him but was acquitted of lying to the court during his successful defamation action against the News of the World in 2006. He was released from jail in January after serving one year of his sentence and vowed to continue the fight to clear his name.