MILAN, June 23 (Reuters) - Eni has reduced the

presence of its personnel at the Zubair oil and gas field in

Iraq as a precautionary move, a spokesman for the Italian energy

group said on Monday.

U.S. attacked key Iranian nuclear sites during the weekend,

joining Israel in the biggest Western military action against

the Islamic Republic since its 1979 revolution.

Eni said it was monitoring the situation across the Middle

Eastern region, in close coordination with authorities.

Shell and Chevron ( CVX ), which also have

operations in Iraq, declined to comment on developments that

might affect their business in the country.

"Our top priority is the safety of our personnel, the

communities in which we operate, the environment, and our

facilities," Chevron ( CVX ) said in an emailed comment.