A family in Uttar Pradesh's Lucknow has been plunged into grief after three siblings died under mysterious circumstances within just 72 hours, prompting the Health Department to launch an investigation into the cause of their deaths.The children, aged three, six and nine, died one after another between Monday and Thursday.The tragedy began on Monday, when the three-year-old boy developed a high fever. His family rushed him to a local health centre, but he died before reaching the hospital.A day later, his six-year-old brother also died suddenly.

The family suffered another devastating blow on Thursday when their nine-year-old daughter complained of severe stomach pain. She was rushed to a hospital, where she died during treatment.Following the deaths, a team of senior Health Department officials was deployed to investigate the circumstances and determine the possible cause.

Doctors said the nine-year-old girl had bleeding from her nose and mouth, raising the possibility of food poisoning. However, her blood tests did not confirm dengue, malaria or typhoid.

A chest X-ray, meanwhile, showed signs of severe pneumonia in both lungs.The CMO said the actual cause of the children's deaths had not yet been established.A four-member medical team, including a paediatrician, was also dispatched. Initial interactions with residents and family members did not reveal any obvious signs of a serious infectious disease.As a precautionary measure, the Health Department will organise a special medical camp on Friday to examine residents and check for any possible health risks.Police and health officials said the cause of the deaths would be established after the post-mortem reports arrive.If required, the bodies of the two other children may also be exhumed for post-mortem examinations.- Ends(Inputs by Ankit Mishra)