Four persons were arrested yesterday while two others were picked up today, Superintendent of Police Sunil Chowdhury said.
H K Maheswari (60) was beaten up by agitated factory workers yesterday when he rejected their demand for an increase in the weekly working hours so that they were paid more. He died later.
Describing the incident as "very unfortunate", Chief Minister Mamata Banerjee had yesterday accused CPI(M) and BJP of being behind the incident. Both the parties, however, denied the charge.