Milan police headquarters bombing

At 11am on 17 May 1973, a hand grenade was thrown at Milan's police headquarters in Lombardy, Italy.[1][2] It happened during a memorial ceremony there for police officer Luigi Calabresi, who had been shot dead in Milan a year earlier.[2] Four civilians were killed by the blast and 45 other people were injured.[1]

The attacker was Gianfranco Bertoli (30 April 1933 - 17 December 2000), who self-identified as an anarchist.[2] He was arrested at the scene and in 1975 was convicted in relation to the attack and sentenced to life imprisonment.