S&P says it has been told U.S. will sue firm over its 2007 ratings on mortgage securities; says suit has no merit.
- It's a winter mess from the SW to NE
- US successfully launches drone from submarine
- World mourns Mandela: 'We will always love Madiba'
- Severe pollution hangs over Shanghai
- Unemployment rate falls to 5-year low
- Scott Brown makes location flub
- Nelson Mandela death: Examining the backlash
- Nelson Mandela's funeral plans
- Nelson Mandela: 10 surprising facts