The only BPF candidate to remain in Assam is Minister Pramila Rani Brahma. She confirmed the development surrounding her party, which is a component of the Opposition alliance.
Police sources said Laskar was interrogated twice for several hours during the last 48 hours and his statements have been recorded in front of a magistrate.
Polling was by and large peaceful although there were some stray incidents of violence.
The voters who did not have masks were provided with one, besides a disposable plastic glove before they were allowed to enter the polling booths.
Bengali-speaking Muslims, considered to be the vote bank of Congress and the minority-based AIUDF, are large majorities in several of these seats.
The incident was reported from the 107(A) Khotlir Lower Primary School polling booth in the Haflong Assembly segment.
There are a total of 12 female candidates and 325 male candidates in the fray, whose fates will be decided by 79,19,641 general electors in the third phase.
The Election Commission heard the matter on Saturday in the presence of returning officer for the constituency Sanjiv Sarma, but no decision has been announced so far.
Earlier, Union Home Minister Amit Shah on Sunday expressed deep grief over the killing of five jawans in the encounter between the security forces and Naxalites near Tarrem in Bijapur district.
Pijush Hazarika, the Minister of State for Health and Family Welfare, said he will come to the police station on Sunday to give his statement.
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 PM said the people would not tolerate those who insult Assam’s pride and identity and give them a befitting reply in the polls.
Campaigning for the third and final phase of Assam assembly elections comes to an end on the evening of April 4.