Middle East Why Yemen, a shaky US ally against Al Qaeda, is cracking apart

The rivalry between Shiite Houthis and Sunni militants, including Al Qaeda's affiliate, has intensified since a power-sharing deal was reached in September. The US is considering a full evacuation of its embassy in Yemen's capital.  

By , Correspondent

Khaled Abdullah/REUTERS

Nearly three years after Yemen ousted a decades-old dictatorship and began a political transition aimed at preventing civil war, the fragile nation is once again on the brink of disaster.