At least 28 people injured in Kenya blast

Kenyan rescue workers and medical staff rush to treat the injured after blast tore through Nairobi's business district.<br/> <br />Doctors at Kenyatta National hospital say as many as as 28 people were injured with at least four of them reportedly in serious condition.<br/> <br />The lunch hour explosion blew clothing and shoes through the window of a local store.<br/> <br />It isn't clear what caused the blast.<br/> <br />SOUNDBITE: Kenyan Police Commissioner Mathew Iteere saying:<br/> <br />"From the preliminary investigations we can rule out a grenade or a bomb attack, most probably it is an electric fault; I am from the site and all indications point to that direction."<br/> <br />The blast in Nairobi came as Kenya experiences a surge in violence throughout the country much of which has been blamed on al Shabab militants linked to al Qaeda.<br/> <br />Deborah Gembara, Reuters