A 60-year-old woman was on Friday killed and four others, including two children, were injured after the roof of their house collapsed when they were sleeping, in Gandhi Camp area here.Raj Rani and four of her family came under the debris of the roof that caved in while they were sleeping, police said.Raj Rani was killed and four others, including two children were injured.Prima facie, the building was weak and Thursday night’s torrential rain might have taken its toll on it, they said.The injured have been hospitalised, while the body of the woman has been sent for post-mortem, they said.