Ending days of speculation, JD(U) state president Vashsisht Narain Singh made it clear that his party will contest the polls "along with the RJD to defeat the BJP".
"Seat sharing will be decided by the leaders of both parties. It is not a big issue," he said. "Our target is to defeat communal forces in Bihar."
On Saturday, the Election Commission said the by-elections will be held August 21.
The 10 constituencies are Narkatiaganj, Rajnagar, Jale, Chapra, Hajipur, Mohiuddinnagar, Parbatta, Bhagalpur, Banka and Mohania.
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