Man, 40, held over Pc Blakelock killing

The 40-year-old suspect, who would have been 15 when the murder took place, was questioned for four days.

The former Tottenham man, who now lives in Suffolk, was released on bail from Bury St Edmunds police station on Monday. One source said the suspect was arrested at Highpoint Prison, near Haverhill, Suffolk, but Scotland Yard refused to confirm or deny this.

Mr Blakelock, a father-of-three, was murdered by a machete-wielding gang 25 years ago during riots in Tottenham, north London.

Sources said the arrest was "significant" and that it was not one of six people originally charged with the murder.

Among them were Winston Silcott, Mark Braithwaite and Engin Raghip, who were convicted of the killing in 1987 but cleared on appeal four years later.

Three youths were also charged with murder but did not face trial after a judge ruled their questioning was inadmissible.

One of them was Yardie gang leader Mark Lambie who was jailed for kidnap and torture in 2002 after terrorising the Broadwater Farm estate.

A fresh inquiry into the murder of Mr Blakelock was launched in December 2003 after a review identified new lines of inquiry.

The unrest on the estate was sparked by the death of Cynthia Jarrett, 49, who collapsed during a police raid on her home.