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 top news
Average household incomes have returned to around the levels they were at before the financial crisis hit, new analysis indicates.
Figures uncovered by a Freedom of Information request reveal one university leader received £623,000 in 2013/14.
Tens of thousands of students are not achieving their potential in state schools, a highly-critical Ofsted report has said.