Aston Villa and Reading have been charged by the Football Association in relation to crowd disturbances occurring after their FA Cup quarter-final matches. It is alleged that Villa and Reading failed to prevent spectators encroaching on the pitch following the clubs' sixth-round victories against West Brom and Bradford respectively. Both clubs have until Thursday to respond to the charge. Reading fans invaded the pitch after the FA Cup quarter-final replay against Bradford at Madejski Stadium . Aston Villa supporters mobbed Fabian Delph and Co after they beat West Brom at Villa Park . The Midlands club's 2-0 win at Villa Park had to be temporarily stopped as fans spilled onto the pitch towards the end of the game and the full-time whistle prompted a mass pitch invasion, as Tim Sherwood's side booked their place at Wembley. Seats were also thrown from the stand holding West Brom's supporters and some Baggies players were confronted by celebrating fans. West Brom expressed their 'deep concern' for the safety of the players after the match and manager Tony Pulis described the scenes as 'disgraceful'. A shirtless man hangs from the crossbar after Villa beat the Baggies in the FA Cup quarter-final . Hundreds of Villa fans celebrated victory over their local rivals by storming onto the pitch . Reading fans also invaded the pitch after the Royals beat Bradford 3-0 in a replay at the Madejski Stadium and one supporter entered the pitch during the contest. Reading lost 2-1 after extra-time on Saturday to Arsenal, who will play Villa in the FA Cup final after Sherwood's side beat Liverpool 2-1. Police formed a line to separate the Reading supporters on the pitch from the Bradford fans in the stands . Hundreds of Reading fans surrounded players from both sides after the Royals won a place in the semi-finals .
Aston Villa and Reading both charged with failing to stop spectators encroaching on to the pitch during FA Cup quarter-finals .
Villa's victory over West Brom was marred by chaotic scenes .
Reading's win over Bradford saw fans invade the Madejski Stadium pitch .
Clubs have until Thursday to respond to FA charges .