Two students have said that 'people jumped the barrier' of the standing area of the concert at the Odyssey Arena in Belfast where are least five people have been taken hospital.
2 students from QUB radio said the standing area in the concert was crammed as many seated people jumped the barrier. http://t.co/n4jkGCaequ
More top news
Police have warned the drug, known locally as "pink champagne", could be deadly.
The author said "It's been wonderful" as fans mark two decades since the children's books opened up a world of magic to millions.
There was something very striking about the pact, which implies the new agreement could remain in place even if the prime minister does not.