Bankruptcy judge Fernando Ciampi is among three people who were killed by a gunman at Milan's courthouse building on Thursday.
The gunman, named as Claudio Giardiello, was arrested at Vimercate, near Monza, by Carabinieri police after trying to flee on a motorbike, Interior Minister Angelino Alfano said.
Ciampi was killed inside his office, sources said.
Giardiello also killed a lawyer, named as Lorenzo Alberto Claris Appiani, and Giorgio Erba, one of his co-defendants in a bankruptcy case, in a courtroom.
There are reports that a fourth person was found dead at the building. This victim reported who showed no signs of being hit by a firearm and may have suffered a heart attack during the incident.
Erba died of his injuries after arriving in hospital in a critical condition.
A relative of Erba's, Davide Limongelli, another defendant in the case, was reportedly injured in the shooting.
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