Some 19 major Italian cities - including Rome, Milan and Naples - are already on red alert, and by Monday all but two will be.
Related stories
One Person Killed and 8 Injured in Airport Attack in Saudi Arabia
Iran’s Fleet of Shadow Tankers Has Run Out of Oil After Monthslong U.S. Blockade
Son of Stephen Hubbard, American freed from Russian jail, speaks out
Brazil's Supreme Court suspends permit for major Amazon gold mine
Japan ends 60-year drought with a bronze medal at gymnastics world championships
‘Umamusume’ concert cancellation highlights visa hurdles for Japanese performers