Glenn Mulcaire has been arrested by police investigating phone hacking and is being held on conspiracy to pervert the course of justice, it has been reported.
Scotland Yard confirmed on Wednesday morning that a 41-year-old man had been arrested and was being held at a south London police station.
Mulcaire spent six months in prison in January 2007 after being found guilty of intercepting voicemails on phones belonging to aides of the Royal Family.
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The private investigator had been hired by the now defunct News of the World to obtain information about public figures.