Authorities in the Russian city of Izhevsk declared a state of emergency situation on Friday due to an oil spill on the Starkovka River that occurred nearly a month ago.The cause of the May 29 fuel leakage, which incorporates a location of 640 square meters in the city near the Volga River, has not yet been determined.Specialists from the regional Natural Resources and Environment Ministry and the Izhevsk civil security administration gathered water samples at 3 points along the river.Ministry data pointed out by the Kommersant business daily reported that there were elevated concentrations of oil products in the water.Boom barriers were set up near the dam where the oil spill was found, authorities stated, and additional barriers are prepared upstream to assist determine where the oil went into the Starkovka.The Natural Resources Ministry stated it did not recognize damage to water resources which there was no threat of the spill spreading beyond the preliminary website of the leak.The cause of the rivers contamination must be developed within the next 2 weeks, and comprehensive procedures need to be taken to resolve the effects of the spill, the Izhevsk city administration said.Officials promised to clean up oil items from the rivers surface and to check and clean both the riverbed and the shoreline.The emergency regime will remain in place until further notice, Izhevsk Mayor Dmitry Chistyakov said.Law enforcement firms have actually opened a probe into the event.