The five-member disciplinary committee headed by eminent lawyer Usha Nath Banerjee today found Aizawl FC "guilty" and asked the Mizoram club to submit the fine before their match against Indian Arrows on February 23.
The AIFF also threatened to conduct matches "closed doors" if Aizawl did not undertake in writing that they will take responsibility for the safety, security and peace at the stadium.
"The committee has come to the decision that Aizawl FC be treated as guilty for spectator violence for the match between Aizawl FC and Mohun Bagan," Banerjee told PTI.
"The coach (Hmingthan Sanga) and assistant coach were warned that any recurrence in future of any indiscipline will be seriously dealt with severe penalty."
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The match ended 1-1 draw and the disappointed home fans vented their ire out on the away side by hurling bottles. Two days later, Mohun Bagan had lodged an official complaint.
"As because there was lack of evidence against the reported utterings of foul languages by the coach and assistant coach of Aizawl FC, the committee is not in a comfortable zone to impose any punishment or hold them guilty."
Besides Banerjee, the meeting was attended by Aditya Reddy, Krishnendu Banerjee while Harsh Vora joined by audio conferencing.
The AIFF has also revoked the red card suspension on Chennai City FC's Edwin Vanspaul in their match against Mohun Bagan in Coimbatore on February 7.