The match referee took a serious note of the incident that happened at the Vidyasagar Krirangan here today.
Furious at their defensive woes that led to the defeat, fans booed East Bengal coach Trevor Morgan by chanting "go back" soon after the loss and a coaching official abused the referee.
The furious fans broke the cordon of the mixed zone and police had to intervene to calm the situation. There were, however, no arrests.
It remains to be seen whether the red and gold brigade will escape any punishment from the All India Football Federation.
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Terming their first half as the worst and horrific, Morgan said: "It's hard to believe (the loss). We were sloppy, lazy in the defence. They had one striker and we have three players and he still went in and scored! Wish I had seven substitutions..."
This was a hat-trick of win for Derrick Pereira who took over four matches ago.
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