Chandigarh:  Eleven people died after inhaling toxic gas in the Giaspura area of Ludhiana on Sunday. Four more persons are undergoing treatment after inhaling toxic gas.

According to the police sources the carcass of a cat was also recovered from the spot. Police have sealed the area and evacuated residents. A magisterial inquiry has been ordered and a police case has been registered against unknown persons.

NDRF team that rushed to the site with air quality sensors detected high levels of hydrogen sulphide in the air. Police officials said they suspect the poisonous gas was released after some chemical was thrown into sewerage.

The deceased were identified as Abhay (13), Aryan (10), Kalpna (16), Kamlesh (60), Varsha (35), Sourav (35), Preety (31), Kavilash (40), Navneet (39), Neetu Devi (39) and an unidentified person.

The incident came to light on Sunday when some people who came to a local store to buy milk fainted. Four persons died on the spot, while others were rushed to hospital. Among the dead were three members of the family that owned the store and five from another family.

Ludhiana Additional Deputy Commissioner Amarjit Singh Bains said that they are collecting samples from manholes. It is likely that some chemicals reacted with methane. Those who died did not show any symptoms of respiratory problems. It is likely the deaths were caused by a neurotoxin. The Punjab Government has announced Rs 2 lakh compensation each for the family of the deceased and Rs 50,000 each for those who fell ill.