<span style="color: #222222;">A gas explosion at a factory in Russia today killed five people and injured three others. Emergency officials said, the explosion occurred in central Oryol region, causing an engineering production facility under construction to collapse.<br />''<br />''It wasn't immediately clear what prompted the explosion. All three injured are reported by Russian media to be Turkish nationals. They have been hospitalised with burns. Local police have opened a criminal probe.</span><br />