Sewer gas Sewer gas Sewer gas is a complex mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage. Sewer gases may include hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides. Improper disposal of petroleum products such as gasoline and mineral spirits contribute to sewer gas hazards. Sewer gases are of concern due to their odor, health effects, and potential for creating fire or explosions. Sewer gas is typically restricted from entering buildings through plumbing traps that create a water seal at potential
17 December 2016 Istanbul explosions 17 December 2016 Istanbul explosions On December 17, 2016, at around 21:30 (UTC+3) four masked people attacked the Peoples' Democratic Party (HDP) office in the Beylikdüzü district of Istanbul, located at a shopping mall. The attackers managed to overcome the security personnel and started a fire, which caused the explosions of the two gas tubes inside the building. One police officer and a security guard sustained minor injuries. In the same night, shots were fired by unidentified assailants at the HDP headquarters in Darıca, Kocaeli Province. Attacks towards other HDP offices across the country have also been reported in İzmir,