A blinding explosion split a Greek-owned oil tanker in two in a port near Athens Tuesday, killing at least seven people and seriously injuring 12, harbor authorities said. The 10:15 a.m. blast rocked the 86,000-ton Anangel Greatness while it was anchored off Perama undergoing routine repairs and "produced a blinding light in the sky," said a harbor authority official. Police said the blast, which touched off fires, was apparently triggered in a fuel tank. The vessel immediately began sinking, said the official, who spoke on condition of anonymity. He said at least seven people were killed and at least 12 were hospitalized, some with severe burns.