Agencies in Benghazi and Tripoli
theguardian.com, Sunday 22 December 2013 17.11 GMT(..)

Car bombs and assassinations of army and police officers are common in Benghazi, where troops have clashed regularly with militants from the hardline Islamist group Ansar al-Sharia.

But a suicide bombing would mark a shift in tactics, and fits a pattern common in other Islamist struggles in the Middle East, but not in Libya either during or since the uprising toppled Muammar Gaddafi.