Badruddin Ajmal said AIUDF will support a leader from Congress as the next CM of Assam if the 'Grand Alliance' is voted to power.
Additional District Magistrate Rajeshan Terang has been asked to conduct the enquiry and submit a detailed report within three days.
The protest rally was not allowed to move forward on the busy arterial G S Road and stopped at the gate of the state Congress headquarters 'Rajiv Bhawan'.
The EC had initially barred the senior Assam minister from campaigning for 48 hours for allegedly making threatening remarks against Bodoland People's Front Chief Hagrama Mohilary.
Campaigning for the third and final phase of Assam assembly elections comes to an end on the evening of April 4.
No deliberate or mala fide intention to disrupt poll process: EC's special observer on Assam EVM row
The observer said the incident appears to be an isolated one due to the total negligence and foolishness of the presiding officer and his team.
The AIUDF Organisational General Secretary Aminul Islam slammed the BJP leader and said the power has made him arrogant and disrespectful.
Three injured in firing by Assam Assembly Deputy Speaker's bodyguards following clashes between BJP, AIUDF supporters
A huge contingent of police and central armed police forces have been deployed, while the district SP has rushed to the spot, officials said.
Gourav Vallabh said that the Congress-led Grand Alliance is on track to achieve its target of winning 101 seats in the elections.
BPF is an ally of the opposition Congress in Assam, where two out of the slated three phased poll got over on Thursday.
Assam Jatiya Parishad enclosed a video, which has gone viral showing Rama Kanta Dewri of handing over money to some women.
Congress delegation meets EC, seeks registration of case against BJP chief JP Nadda, Assam CM Sarbananda Sonowal for ads
Rajiv Shukla alleged that the ruling party at the Centre and in the state of Assam is flouting the law and strict action should be taken against it.
Congress used minorities as commodity, exploited their sentiments for vote bank politics: Jitendra Singh
Jitendra Singh said a dangerous phenomenon is being witnessed in the Assam election and the BJP is determined to thwart this evil design.
Sachin Pilot claimed that the assembly election in Assam is a struggle to save the people of the state from the misrule of the BJP.
Congress urges EC to register FIRs against JP Nadda, Sarbananda Sonowal for ads predicting outcome of Assam polls
Surjewala told that the advertisements have been presented in a manner on the front page of every newspaper to prejudice the minds of the voters of Assam.