In the first incident, Chander Bhushan, a retired employee from the irrigation department was shot dead by unidentified men at his house in Hasanpur village in the Shamli district yesterday.
According to circle officer Sunil Kumar, police has registered a case against five people who are absconding. One Braham Singh has been identified so far.
The body has been sent for postmortem and further investigations are underway.
In the second incident, a 34-year-old farmer Rajender was shot dead by unidentified men at Pawti village under Kairana police station in Shamli district.
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The third incident was reported from Dolatpur railway crossing where 50-year-old Rambir Singh jumped to death before a moving train.
A 30-year-old man jumped before a train near Jamsath flyover in the fourth incident.
The bodies have been sent for postmortem, police said.