Four people were killed and 10 injured on Saturday after a hot water pipe burst at a shopping mall in western Moscow, officials said. The city’s mayor, Sergei Sobyanin, said some of those injured had suffered burns and that emergency services were working at the scene. Russian news agencies quoted investigators as saying that there had been no ammonia leak at the site as had been suspected for a time. Video footage showed flooding throughout the building and steam flowing out of a doorway. The mall, known as Vremena Goda (the Seasons), opened in 2007 and contains more than 150 stores.