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.
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Taken in the White Drawing Room at Windsor Castle, a new photograph marks the couple's 70th wedding anniversary.
The 69-year-old republic veteran told the annual Sinn Fein Ard Fheis it would be his last as leader.
A body has been found in the search for missing teenager Gaia Pope.