A Catholic nun has been arrested by Italian police on suspicion of assisting a mafia network.

One of a group of 25 people arrested in the police operation, Sister Anna Donelli is alleged by prosecutors to have taken advantage of her role as a prison volunteer to act as a contact between jailed members of the so-called 'Ndrangheta mafia gang and members of the gang on the outside, reports the Daily Telegraph. The gang is engaged in extortion and drug trafficking.

The Telegraph notes that the 57-year-old Sister volunteered at San Vittore prison in Milan and earlier this year won a civic award in recognition of her work in jails and in deprived areas of the city.