East Africa saw the emergence of a new international terrorist group, as Somalia's most dangerous al-Qaida-linked militia claimed responsibility for the twin bombings in Uganda that killed 74 people during the World Cup.

The claim Monday by al-Shabab, whose fighters are trained by militant veterans of the conflicts in Afghanistan and Iraq, resets the security equation in East Africa and has broader implications worldwide. The group in the past has recruited Somali-Americans to carry out suicide bombings in the Somali capital Mogadishu.