The deceased were identified as Birender Kumar Singh (60) and his son Parmeshwar Kumar Singh (35), Station House Officer (SHO) of Gautambuddha Nagar police station, Lalan Kumar Singh said.
The injured included a pregnant woman, the SHO said.
The bodies were sent to Siwan Sadar Hospital for post-mortem.
No arrests were made so far in connection with the case, he added.
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