BJP general secretary Dominic Tadar in a press release today said the party is fully prepared to work for the victory of the candidate.
He, however, did not name the candidate.
The Kanubari seat fell vacant after its MLA Gabriel Denang Wangsu resigned.
The BJP is extending outside support to the Kalikho Pul-led PPA government in the state which was installed on February 19 last after months of political turmoil.
The PPA is yet to finalise the candidate.
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Opposition Congress is yet to finalise its candidate for the by-poll.
Counting of votes would take place on May 19 along with five other states where Assembly elections are going on.
Meanwhile, the BJP has identified seven areas in Itanagar as most disaster-prone and suggested the Capital Complex administration to declare those areas as 'disaster-prone area'.
The areas which the party identified as disaster-prone include, shopping and residential complexes along C-Sector, '0' point and Mithun Gate, Akash Deep and Vivek Vihar streams, banks of Yopo Nallah and River Senki as well as Chandranagar area.