KANO, Nigeria : Gunmen opened fire on worshippers at a mosque near northern Nigeria’s main city of Kano, killing three of them and wounding 12 as they prayed, witnesses  and police said on Wednesday. Police spokesman Musa Majiya declined to speculate on who was behind Tuesday night’s attack in Kwankwaso village, about 30 km from Kano and home of Kano state governor Rabi’u Musa Kwankwaso. Criminal gangs also operate in the area. “We were inside the mosque praying when we heard gunshots just as we were almost finishing the prayer,” witness Adamu Inuwa said, speaking by telephone from a hospital bed where he was nursing a gunshot wound.