ROME (Reuters) - Part of a Roman wall in Pompeii's ancient ruins has collapsed, authorities said on Saturday, a year after a gladiator house in the site crumbled and embarrassed Italian Prime Minister Silvio Berlusconi's government.

A chunk of the exterior of a perimeter wall in the Porta Nola area crumbled overnight between Thursday and Friday after bad weather in the area, Pompeii's archaeological superintendent department said in a statement.

The collapse involved a roughly four metre-by-two metre (four yard-by-two yard) portion of wall in an area that is less frequented by tourists.

The damage was "limited and contained", the statement said....