As a political slugfest has erupted over the cancellation of a concert by popular playback singer Arijit Singh at the Eco Park in Kolkata scheduled for early next year, Leader of the Opposition in West Bengal Suvendu Adhikari has referred to a Twitter message by Chief Minister Mamata Banerjee in October 2015 over cancellation of a concert by Pakistani singer Ghulam Ali in Mumbai following threats from Shiv Sena.