The IPCC will also examine the actions of West Yorkshire Chief Constable Sir Norman Bettison. #ipcchillsborough
Correcting an earlier tweet - IPCC will look at actions of South Yorkshire and West Midlands Police. #ipcchillsborough
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The memorial service will be attended by Prince Harry and Meghan Markle.
David Browning admits manslaughter by diminished responsibility but denies murder.
Four people have died and the suspect is still at large, police said.