HKO downgrades rainstorm warning signal to Amber
The observatory downgraded the Red Rainstorm Warning signal to an Amber alert at 10pm on Friday, saying people should remain vigilant as heavy rain continues to affect Hong Kong.  Areas in the northeastern parts of the New Territories, including Tai Po, Ma On Shan, Sha Tin and Sai Kung, were worst affected by the downpour.  Online videos showed some roads in Sai Kung being badly flooded.  "People who are likely to be affected should take necessary precautions to reduce their exposure to risk posed by the heavy rain and flooding," the forecaster said.  It also warned people to stay away from watercourses, saying heavy rain may bring about flash floods.