Nine people are under investigation for two collapses in the famous ancient Roman city of Pompeii that shocked the culture world last month, judicial sources said on Thursday.

An ancient training centre for gladiators collapsed into rubble in Pompeii on November 6 and a wall protecting a home known as the House of the Moralist fell down on November 30, causing widespread international outrage.

Among the people under investigation by prosecutors in nearby Torre Annunziata are the former director of the site and the current head of excavations, ANSA news agency reported. The two declined to comment....