MENTOUGOU - At least 20 people were killed and 19 were missing after heavy rains lashed Beijing and surrounding provinces, state media said Tuesday, in downpours that have submerged roads and deluged neighbourhoods with mud. Storm Doksuri, a former super typhoon, swept northwards over China after hitting southern Fujian province on Friday, following its battering of the Philippines. Heavy rains began pummelling the capital and surrounding areas on Saturday, with nearly the average rainfall for the entire month of July dumped on Beijing in just 40 hours. Swaths of suburban Beijing remain badly hit by the rains -- some of the city’s heaviest in years. On the banks of the Mentougou river, one of the worst affected areas, AFP reporters saw muddy debris strewn across the road.  One man told AFP he had not seen flooding this bad since July 2012, when 79 people were killed and tens of thousands evacuated.