As soon as the house assembled for the day to resume its session after the weekend break, Speaker Sumitra Mahajan read out a brief statement describing the actions of the wrongdoers as an act of "cowardice".
The house also stood in silence for a while as a mark of respect for the departed.
On August 5, in a worst terror attack in northeastern state of Assam since 2014, gunmen in military fatigues opened fire at a crowded market in Kokrajhar town on Friday, killing 13 civilians.
Read More: 14 killed in Assam militant attack
One of the attackers was also killed after an army patrol party fired back.
Authorities in the state have blamed the anti-talks faction of the National Democratic Front of Bodoland (NDFB) led by I.K. Songbijit, who carries a reward of Rs 10 lakh on his head, for the massacre.