The incident occurred last night under Sikhera police station, when the victims were returning home from factory, SSP H N Singh told PTI here today.
The three have been identified as Surender(25), Kunwerpal (27) and Sunder (21).
Their bodies, which sustained injuries from sharp-edged weapons, have been sent for postmortem, police said.
Meanwhile, an irate mob today protested against the incident and blocked the Bahadurpur-Jansath road for several hours. The villagers alleged that four other persons are also missing from the village since last night, police said.