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PUGLIA, ITALY - JULY 13: Italy's Prime Minister, Matteo Renzi visits site where at least 27 people died in a head-on collision between two passenger trains, near Corato, in the southern Italian region of Puglia on July 13, 2016. (Photo by Tiberio Barchielli / Prime Ministry of Italy/Anadolu Agency/Getty Images)

PUGLIA, ITALY - JULY 13: Italy's Prime Minister, Matteo Renzi visits site where at least 27 people died in a head-on collision between two passenger trains, near Corato, in the southern Italian region of Puglia on July 13, 2016. (Photo by Tiberio Barchielli / Prime Ministry of Italy/Anadolu Agency/Getty Images)