A 73-year-old woman was killed and four others including a child were injured Saturday when a taxi accelerated suddenly and mounted a central Tokyo sidewalk, while the taxi driver also later died.The woman, Kumiko Kobayashi, was struck and killed while walking on the sidewalk in the capital's Chiyoda Ward at around 4:20 p.m. Hitoshi Yamamoto, the 64-year-old driver who was in critical condition after the accident, died in hospital, the police said Sunday.Police believe the accident might have been triggered by a sudden health problem experienced by the driver, as an emergency signal in Yama…READ FULL ARTICLE