The Officer-in-Charge of Shyampur police station, Suman Das, was seriously injured in the attack and still remained critical, being put on ventilator support in a city hospital.
Das had gone to the village to execute a court order on a land dispute along with other policemen.
The five persons were held today from Jagdishpur village under Dholahat police station in South 24 Parganas district, a police officer said.
All the five are said to be relatives of the main accused, Munsi Matiar Rahaman, Sharma said.
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Rahaman was on January 6 arrested along with six others in connection with the case. They were produced in a local court, which remanded them to five days police custody.
Das, 44, was chased down a road for over half a kilometre by a mob, and brutally beaten with rods and bamboo sticks.
He was immediately taken to a local hospital for check up, but admitted to private-run Belle Vue Clinic in Kolkata with severe head injury.
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