A laboratory test has confirmed that a diarrhoea outbreak, which has killed at least four patients and affected over 1,400 people in Indore, was caused by contaminated drinking water, officials have said. The test findings substantiated that a life-threatening drinking water supply system prevails in parts of Madhya Pradesh's commercial capital, which has been ranked India's cleanest city for the last eight years. Indore's Chief Medical and Health Officer (CMHO) Dr Madhav Prasad Hasani told reporters on Thursday that a laboratory report prepared by a city-based medical college confirmed drinking water was contaminated due to a leakage in a pipeline in the Bhagirathpura area, from where the outbreak has been reported. He did not share the detailed findings of the test report. Officials have said that a leakage was found in the main drinking water supply pipeline near a police outpost in Bhagirathpura at a spot over which a toilet has been constructed. They claimed the leakage led to