George Martin, the Beatles' record producer, assisted in taping the band's 23 August Hollywood Bowl concert for a proposed live album; given the audience's relentless screaming, he said it was "like putting a microphone at the end of a 747 jet". When the Beatles played in Chicago on 5 September, a local policeman described the adulation as "kind of like Sinatra multiplied by 50 or 100". "Variety" reported that 160 females were treated for injuries and distress in Vancouver, after thousands of fans charged at the security barriers in front of the stage. At Jacksonville on 11 September, 500 fans kept the Beatles trapped in the George Washington Hotel car park after the group had given a press conference at the hotel. With only a dozen police officers on hand, it took the band 15 minutes to move the 25 feet from the lift to their limousine. Harrison refused to take part in the scheduled ticker-tape parades, given Kennedy's assassination the previous year. He said that the constant demand on their time, from fans, city officials, hotel management and others, was such that the band often locked themselves in their hotel bathroom to gain some peace.