An explosion at an oil refinery in Indonesia early Saturday injured nearly 150 people and caused about 7,000 residents to flee their homes. The explosion took place at a joint Pertamina-Petrochina oil refinery in the eastern Java province as workers tried to contain a gas leak by setting it on fire. There were no deaths reported, but nearly 150 people were hospitalized suffering from respiratory problems after inhaling gas, local police chief Rumhadi said.