Referee Mark Clattenburg, pictured this morning, left, has been accused of aiming insults at Chelsea players during a tense match which saw fans hurling coins onto the pitch. Chelsea have launched an official complaint against Clattenburg, pictured disciplining Chelsea player Fernando Torres during the match, right, for allegedly hurling a racist insult at black midfielder John Obi Mikel. Players have also accused the referee of insulting a Spanish player by labeling him a ‘Spanish Tart’. It comes just a month after a racism storm engulfed Chelsea captain John Terry.