Later, constable Ashok Gathe (30), posted at Pandhrinath police station, also tried to kill himself with the same rifle and in the process got seriously injured, the police said.
Surprisingly, after piercing through Gathe's body, the bullet hit another youth Amit Tiwari (25) who is also the son of a police constable.
The incident took place in Krishnabagh Colony area where Gathe opened fire at his mother-in-law Gaura (40) and father-in-law Mansharam Pagare (45), causing grievous injuries.
Both Gathe and Tiwari are also undergoing treatment in a hospital, the police said.
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Pagare's daughter, Varsha, got married to Gathe in 2011 but due to alleged dowry harrassment, she left her husband's place along with her one-and-half-year-old daughter and lived with her parents.
However, Gathe allegedly used to scold and abuse her even at her parents' residence, after which Varsha and her parents filed a dowry harrassment case against Gathe at Vijay Nagar police station.
The police suspect that because of this case he got very angry and took the extreme step.