File on 4 investigates events that led to the death of two people at London's Brixton O2 Academy in December. The venue was shut down after the fatal crowd crush ahead of a concert by the Nigerian artist Asake. Security guard Gaby Hutchinson, 23, and Rebecca Ikumelo, 33, died in hospital after the incident at the south London venue on 15 December. Some said ticketless fans tried to force there way into the venue. But File on 4 has heard compelling evidence that suggests there were other reasons the venue became overcrowded. Producer: Anna Meisel Reporter: Greg McKenzie Assistant Producer: Patrick Kiteley Digital Producer: Melanie Stewart-Smith Journalism Assistant: Tim Fernley Technical Producer: Craig Boardman Editor: Carl Johnston