TIFE OWOLABI AN explosion on a Nigerian oil pipeline owned by Shell killed at least 12 people, authorities at the scene said, while members of the affected community in Emohua said they feared many more had died in the blast. A spokesperson for Shell Petroleum Development (SPD) company of Nigeria Limited said a fire occurred on its Rumuekpe-Nkpoku Trunk Line in Rivers State and that it was working with authorities to put it out. Garuba Yabuku, civil defence spokesman for Emohua, in Rivers State, the heart of Africa's biggest oil industry, said the incident was reported around 4:30 a.m. (0330 GMT).…