Witness : Gunmen shot at people as traders were closing market in Kawuri on Friday . Witness : Attackers first posed as traders . Police and Islamist militant group Boko Haram believed to have ordered the attack .
Police : Gunmen shot at people as traders were closing market in Kawuri village Sunday . Witness : Attackers first posed as traders . Police say Islamist militant group Boko Haram believed to have launched the attack .