– Tony Whitehead, RSPB
It's a refined mineral oil, which is a colourless and odourless substance, and it's related to petroleum jelly. We don't know where it came from and we need to do a lot more testing on this substance to try and track it back to its source. There are people speculating it could be from a ship, that's possible but we just don't know yet. We need to look at what happened and if appropriate take legal action and also, frankly, shame the people.
More sea birds could die from a pollution spill that has contaminated England's south coast. Wildlife experts say a change in wind direction is now blowing many birds out to sea and could lead to more fatalities in the coming days.