Manipur chief minister Nongthombam Biren cast his vote at a polling station in Heingang in Imphal. The returning officer of inner Manipur parliamentary constituency served a show cause notice to Biren for alleged violations in the model code of conduct by making defamatory statements against Congress candidate Oinam Nabakishore during an election meeting on 29 March at Yumnam Khunou in Imphal East.
In his election speech, Biren made reference to former chief secretary O Nabakishore being unceremoniously removed from his post for being involved in numerous scandals which the latter has claimed as defamatory that could tarnish his image and mislead voters. Following the complaint of the Congress candidate, the returning officer had directed Biren's secretary to offer an explanation.