Former Nairobi Mayor Joe Aketch (right) and other members of the public assist firefighters at the scene of the blast on Moi Avenue in central Nairobi on May 28, 2012. A blast ripped through a small shopping complex in central Nairobi and left at least 30 people wounded. Kenya has been hit by a wave of grenade attacks the police repeatedly blamed on the al-Shabaab. AFP PHOTO