A 30-year-old woman and two of her children were beheaded overnight in Afghanistan's east, police said, in what appeared to be the latest in a rapidly growing trend of so-called honour killings.Police said they suspected the woman Serata's divorced husband of barging into her house in the capital of Ghazni province and murdering her, alongside their eight-year-old son and nine-year-old daughter.'The children saw the killer take their mother's head off, so he killed them too,' a local policeman said, adding that the attacker had spared Sereta's two-year-old daughter. Activists say there has been a sharp rise in violent attacks on women in Afghanistan over the past year.