Six labourers were killed after a poisonous gas leaked from a ceramic unit near Morbi town in Rajkot on Saturday, the police said.

The incident occurred early this morning at Comet Ceramic Company when six labourers entered an underground tank for cleaning.

The victims were admitted to a local hospital but doctors declared them brought dead. Police identified them as Poonamsingh Jogda, Nansingh Kalu, Amra Vasta, Vishnu Kanti, Rupsingh and Adanand Pandit.

A case of accidental death has been registered and further investigation is on, police added.