Analysis of information sources in references of the Wikipedia article "Years of Lead (Italy)" in English language version.
On 12 December 1969, a bomb exploded in the Banca Nazionale dell'Agricultura at the Piazza Fontana in Milan. [...] The bombing is [...] commonly regarded as the beginning of the Italian anni di piombo (years of lead) which lasted for almost twenty years.
Rimase ucciso, al volante dellu su jeep, un poliziotto ventiduenne, Antonio Annarumma [...].