Questions from the audience included one from a man who had survived the crush at the football ground in 1989 which claimed the lives of 96 people.
The 'difficult time' Clark was referring to was an incident in 2009 on the 29th anniversary of the disaster when Burnham - then Secretary of State for Culture, Media and Sport, delivered a memorial speech.
South Yorkshire Police Chief Constable David Crompton has been suspended over his response to Hillsborough since the results of the enquiry were announced.
The South Yorkshire Police and Crime Commissioner Dr Alan Billings said he “had been left with no choice” other than to suspend “with immediate effect” Crompton“following the run-up to and delivery of the Hillsborough verdicts”.
The move comes after Hillsborough families called for the police chief’s resignation after jurors found that the 96 football fans who died in the disaster 27 years ago were “unlawfully killed”.
The Crown Prosecution Service has confirmed it will begin the process of considering whether criminal charges should be levied. Crompton was castigated in 2013 after accusing Hillsborough families of lying in their accounts of the disaster.