"I thank people for the continued faith in BJP & in the BJP's unwavering focus on development and good governance," Modi tweeted after the results of bypolls to Lok Sabha and Assembly seats came in.
"I congratulate all BJP Karyakartas & leaders for the impressive victories in Madhya Pradesh, Assam and Arunachal Pradesh," he said.
In Madhya Pradesh, BJP won Shahdol Lok Sabha seat and bagged the Nepanagar Assembly seat, where it increased its winning margin to 42,198 votes as against 22,178 previously.
In Arunachal Pradesh, BJP's North East Democratic Alliance (NEDA) candidate Dasanglu Pul won Hayuliang assembly by-poll. Pul is the youngest of the three wives of former Chief Minister Kalikho Pul. The bypoll was necessitated by his suicide.
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"I appreciate @BJP4Bengal for the spirited performance. BJP is fully committed to diligently serving the wonderful people of West Bengal," Modi said in another tweet.
In West Bengal, Trinamool Congress swept Tamluk and Coochbehar Lok Sabha constituencies in West Bengal by a whopping margin of over 4.9 lakh votes, almost doubling the gap from 2014 polls.
"Congrats to Tripura BJP Karyakartas for an impressive performance in the bypolls. Good to see BJP expanding its base in the Northeast," the Prime Minister added.