The latest pictures appear to show that workers have used booms to set up a perimeter in the waters of the Mantua Creek to contain any chemical spill.
More top news
Responding for the first time to recent questions over the death of a steward, Walsh insisted the evidence said cabin air was safe.
The man identified as the Islamic State militant known as "Jihadi John" was a "popular" schoolboy who loved Manchester Utd and S Club 7.
Everton, the only British side left in the Europa League, have been handed a tough tie against Dynamo Kyiv in the last 16 round