Ramesh Kewat, Riyaz Fakir and Dildar were arrested on Tuesday in Nautanwa area of Maharajganj, about 350 km from here. Kewat was wanted in six cases of murder, including that of Maoist leader Vinod Upadhyay in Nepal.
A .9 mm pistol and a number of cartridges were recovered from their possession, police said.
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