An explosive device has gone off in southern Italy outside a centre for young migrants that is headed by a crusading anti-mafia priest.

The Ansa news agency said no one was hurt and the Centre South doorway in Lamezia Terme was only slightly damaged.

The centre is housed in a building confiscated from the 'ndrangheta mafia, based in Italy's Calabria region.

The centre's founder, Father Giacomo Panizza, said the attempted intimidation would not stop his efforts.

Separately, an explosive device went off outside the offices of Italy's tax collection agency in Olbia, on Sardinia, causing no injuries, Ansa said.

On December 9, a letter bomb sent by Italian anarchists exploded at the Rome office of Equitalia, wounding the organisation's director.

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