The Confederation of Africa Football (CAF) announced the unprecedented measure in response to the violent scenes at the end of Setif's 2-0 home loss to Mamelodi Sundowns of South Africa on Saturday.Objects were thrown onto the field while some fans invaded the pitch in stoppage time.CAF said in a statement that the referee had abandoned the match due to the pitch invasion and after spectators and security personnel had been injured by "missiles, stones, bottles, and firecrackers".Under competition rules, any match halted because of violence leads to the disqualification of the home team.The result of the match was wiped out and the group has now been left with three teams -- Sundowns, Enyimba of Nigeria and Egypt's Zamalek. The top two advance to September's semi-finals.3 teams remain in Group B. @ZSCOfficial@EnyimbaFC and @Masandawana. Two teams will qualify for the next round #CAFCL— CAF (@CAF_Online) June 23, 2016junkThe decision marks the first time a club has been expelled from the Champions League since the group format was introduced to Africa's top club competition in 1997.Here is the full CAF statement:"Following the regrettable incidents that took place during match no.98 of the 2016 edition of CAF Champions League between ES Setif (Algeria) vs Mamelodi Sundowns (South Africa), whereby the referee was obliged to abandon the said match before its end."Match officials noted especially the pitch invasion as well as numerous throws of missiles, stones, bottles, and firecrackers, provoking a certain number of injured spectators and members of the security forces."The CAF Organizing Committee for the Inter-Clubs Competitions decided to apply the provisions of Chapter XII para 3 and considered ES Sétif loser and eliminated from the competition without prejudice to any other sanctions that may be imposed by CAF Disciplinary Board."Chapter XII para 3 stipulates: “3. If the referee is forced to stop the match before the end of the regular time because of invasion of the field or aggression against the visiting team, the host team shall be considered loser and shall be eliminated from the competition, without prejudice to the sanctions existing in the regulations.”"Concerning the result of the said match, it is hence cancelled in conformity with the spirit of article XI.13 of the regulations stipulating: “If a team withdraws after the start of the group matches without having played half of the group matches, the overall results of the matches in which this team participated is cancelled.”..