A man claiming to have kidnapped an Italian aid worker in Afghanistan told media overnight he had killed her, but a government spokesman said she was still alive. Clementina Cantoni, 32, who works for the CARE International aid agency, was snatched this week when four gunmen stopped her vehicle on a central Kabul street and bundled her into a white Toyota car. Timoor Shah, who has claimed in several conversations with media to be holding Ms Cantoni, said he killed her after President Hamid Karzai's government refused to accept his demands. "We strangled her with a rope at nine...