Officials today launched an investigation after one of Sadiq Khan's electric buses exploded during today's rush hour. Terrified residents in Wimbledon described a massive 'bang' after a double decker burst into flames during this morning's commute, sparking chaos on the roads as black smoke filled the streets. Astonishing video obtained by MailOnline shows the dramatic moment firefighters battled to put out the inferno. Transport for London (TfL) today launched an investigation after the blaze destroyed the rear and blew out the back windows ... 'It took a long time for them to get it under control with flames flying out...