All the four labourers, natives of Malda district of West Bengal, were trapped under a heap of debris yesterday. While two died on the spot, the rest succumbed to injuries in hospital.
The victims were identified as Rajkumar Mandal (26), Hatim Mian (35), Madan Manjhi (28) and Mohammed Shamser (38).
Raids were being carried out to arrest the brick kiln owner Minhaj Alam who was absconding, police said.