I drove past it in the taxi and people were pilling out into the street looking none too happy. The police and ambulances were just starting to arrive. It looked like they were trying to stop people leaving the venue, but I could be wrong on that. A couple of people tried to hail me, but I just drove on. It wasn't until later in the night that I realised what had happened.
Theres a video doing the rounds that I saw on Facebook.