Turkish police have arrested 11 people over the murder of an American woman who disappeared while visiting Istanbul last month, police and the local media reported Sunday. -snip- "We have confirmed that she was murdered by way of impacts on her head," Istanbul police chief Huseyin Capkin told reporters on Sunday. "But we need to conclude the investigation before details emerge." The Milliyet newspaper said she was also stabbed several times in her abdomen, but there was no sign of rape or theft and she was still wearing jewellery when police found her. -snip- Hurriyet speculated that Sierra might have...