| Fierce gun battle rocks Mogadishu [5 mins][Muqdisho] At least 15 people are killed as insurgents attack the Somali capital, Mogadishu, witnesses say. | Citigroup eyes options, including merger (Reuters) [23 mins] Reuters - Citigroup Inc lost more than one-quarter of its market value on growing worries over whether it has enough capital to withstand billions of dollars of potential losses and despite new support from its largest individual investor. |