Forest fires rage in Siberia, with regional centre Tomsk being the worst affected.<br/> <br />Tomsk is enveloped in thick smog which led to the closure of the local airport and dozens of flight delays and cancellations.<br/> <br />Forest fires already destroyed 15,000 hectares of Siberian forest, the Russian Emergency Ministry said on Friday.<br/> <br />Firefighters tried to put out more than 30 wild fires on Friday, employing helicopters to dump water onto burning patches of forest.<br/> <br />Fires threaten to spread further due to abnormal heat and strong winds.
