By Temilade Adelaja and Seun Sanni OWO, Nigeria (Reuters) – Streaks of blood on the floors and walls, sandals abandoned in a desperate rush to escape, a well-thumbed Bible lying among shards of glass. Those were some of the disturbing sights inside St Francis Catholic Church in the Nigerian town of Owo after unknown assailants attacked the congregation with guns and explosives during Sunday mass, killing and injuring dozens of people. “All of a sudden when the mass was about to end we heard two gunshots near this side, so everyone began to run,” said Francis Obi, speaking outside the church th…