British police probing the 1982 murder of "God's banker" Roberto Calvi have made their first arrest.
Roberto Calvi was found hanged under Blackfriars Bridge in London
A 42-year-old woman has been questioned on suspicion of conspiring to pervert the course of justice and perjury. She
was freed on bail until February.
The allegations are thought to concern testimony at an inquest into the death of Mr Calvi, who was found hanged under London's Blackfriars Bridge in 1982.
He had been chairman of the bankrupt Vatican-linked Banco Ambrosiano.
Mr Calvi, 62, was found hanged with bricks in his pockets and £15,000 in cash. He had disappeared during a huge investigation into Banco Ambrosiano, once Italy's biggest privately-owned bank.
An inquest recorded a verdict of suicide but a second recorded an open verdict.
In September this year, City of London Police reopened their investigation as a murder inquiry.
Since then, they have worked closely with the Italian authorities, who have identified four suspects, including a Mafia boss.
Mr Calvi's family believes his death was linked to an organised criminal conspiracy.
Police are carrying out new forensic tests on the scaffolding poles from which his body was found hanging and on glasses and the money found on him.
Detective Superintendent Trevor Smith, who recently returned from Italy, said: "We have been applying 21st Century forensic and investigative techniques to a
21-year-old crime - and we have been working closely with our Italian counterparts.
"As a result of these investigations, we have today arrested a woman, and have questioned her in relation to events surrounding Mr Calvi's murder in 1982."