A large fire has erupted overnight at the plant for alkaline paints and resins "Orgahim" in Bulgaria's...city of Ruse. The Ruse Mayor...reported...that the fire has been tamed. Three workers have inhaled harmful gases – they were sent to the local hospital and later released. The...City Hall further inform that there is no danger for residents and visitors of the city...In addition to thick smoke and the blaze, several secondary explosions have occurred along with a partial gassing of Ruse. Inspectors from the Regional Inspectorate of the Environment and Waters are measuring harmful substances...According to initial information, the fire erupted over overheating of the boiler system of the plant...The amount of chemicals stored there remains unknown...The authorities are probing the cause of the fire.