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
A car bombing outside a popular ice cream parlour in Baghdad has killed 13 people and wounded 24.
Both Theresa May and Jeremy Corbyn have been forced to defend their records and answer tough questions from an audience in a TV grilling.
Patchy rain affects northern areas of the UK in the next 24 hours. Elsewhere, dry but rather cloudy.