LUCKNOW, Oct. 18 -- Four people, including a couple, were killed and two others injured when a speeding ambulance overturned after a tyre-burst on the Delhi-Lucknow highway within Sitapur's Ataria police station limits on Monday morning, senior police officials said. The ambulance, going from Dehradun to Varanasi via Sitapur, was carrying a patient who also died in the mishap.p5...