Chelsea have apologised after some of their supporters booed and jeered during the one-minute's silence before their FA Cup semi-final to remember those who died during the Hillsborough tragedy.
Chelsea have said they are "extremely disappointed" and "embarrassed" at the small section of supporters who did not observe the minute's silence in remembrance of the 96 Liverpool supporters who died at Hillsborough in 1989.
The tribute at Wembley was cut short by referee Martin Atkinson after the silence was interrupted a by a section of Chelsea supporters.
Chelsea went on beat Tottenham Hotspur 5-1 to set up a final against Liverpool an 5 May after they beat Everton 2-1 in their semi-final.
A statement released by the club read: "Chelsea Football Club is extremely disappointed that a very small minority of fans embarrassed the club by not honouring the moment's silence before kick-off.
"Chelsea FC believes all moments of respect should be honoured and today we pay our full respects to all those that suffered as a result of the Hillsborough disaster 23 years ago.
"The club will be working with Wembley and the FA to identify those responsible and if we are provided with evidence that season-ticket holders or members have been involved we will take the strongest possible action against them."
A minutes' silence was observed at the other semi-final between Liverpool and Everton on 14 April.
Liverpool had requested that the match should not be played on Sunday, 15 April, which was 23 years to the day that the disaster occurred.