In the morning, the DMK issued a red-alert. It would not hesitate to pull out of the UPA coalition if last week's increase in petrol prices were not rolled back, announced party leader M Karunanidhi to a cheering crowd of supporters in Chennai. By the afternoon, the 88-year-old leader had confirmed what everyone knew all along - that this was just an empty threat, aimed at distancing his party from an unpopular decision taken by the Centre.