The four, including a woman, were produced in the SDJM's court in connection with the death of Koushik Purkait, a student of an ITI institute in the district, who was fatally beaten up by a mob at Harindanga in the district on May 9 night.
The judge rejected their bail plea and remanded all the four to 13 days' police custody.
They were charged with causing grievous injury, illegal confinement and abduction.
Purkait, who came to visit his aunt's residence in the area and was roaming around when he was confronted by members of a local club and forcibly taken to a room. He was later rescued by his relatives who rushed to the spot on hearing about the incident and took him to Diamond Harbour Hospital.
Meanwhile, a mob today set ablaze a fruit orchard and
ransacked some houses in the area as the student's body was brought to his aunt's village where the murder took taken place, a police officer said.
CPI(M) candidate from Raidighi and former West Bengal minister Kanti Ganguly also accompanied the body brought from Kolkata morgue and tried to pacify the mob but was caught in the melee.
The police officer said Ganguly did not suffer any injury or bruises nor was he manhandled by the crowd.
The body was later taken to youth's residence at Mandirbazar in a large procession.
