Reacting to the development, Chief Minister Devendra Fadnavis said the "change" will happen in state irrespective of whoever comes along with BJP, while state unit president asserted that state government will complete its full term.
In a combative speech aimed at galvanising his party workers, Thackeray raked up the controversy over replacement of Mahatma Gandhi's photos with Prime Minister Narendra Modi's on calenders of Khadi Udyog.
Blaming BJP for "insulting" Sena, he said, "Sena will not go for an alliance in upcoming civic elections. We will unfurl the bhagva (saffron) flag in Maharashtra all alone."
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Thackeray said Sena needed foot soldiers who had the "courage to launch a frontal attack, instead of indulging in "back-stabbing".
"Once I have taken the decision, I do not want anybody to question it. If you promise to stand by me, I have taken the decision to go it alone in Maharashtra. I will not go to anybody with a begging bowl for alliance and will not be at anybody's mercy. I have decided there will be no alliance for any of the coming municipal corporation or zilla parishad polls," he said evoking huge applause.
The last straw on the fate of alliance came when Sena whittled down BJP's claim to contest 114 out of total 227 seats for BMC to mere 60.
The talks for the civic polls dragged on as both the parties engaged in muscle-flexing over seat-sharing formula.
In the 2012 BMC polls, Sena had contested 158 seats and won 75, whereas the BJP won 32 out of 69 seats it had fought.