In Turkey, at least four people were killed and two others injured in an explosion at an oil refinery in Izmir. State-run Anadolu Agency said the blast occurred today during maintenance work on a product tank at the Tupras oil refinery.<br/><br/>Bayram Yilmaz, the Governor for the Aliaga district in Izmir province, western Turkey, said that the blast occurred during work on a naphtha gas tank that had been out of use for a long time and confirmed that the explosion was an accident caused by gas pressure in a boiler. There was no fire at the site and that production is continuing at<br/>the facility operated by Tupras.