Liverpool fans booing the national anthem before the FA Cup final was "not something I enjoyed", says manager Jurgen Klopp.
Liverpool supporters booed 'Abide With Me' and 'God Save the Queen' before kick-off at Wembley on Saturday.
However, the German boss also said: "It's always best to ask the question - why does this happen? They wouldn't do it without a reason.
"Maybe I'm not here long enough to understand. I am sure it's historical."
Liverpool lifted the FA Cup for the eighth time when they beat Chelsea in a penalty shoot-out following a goalless 120 minutes.