(Reuters) -Eighteen people were killed and 13 injured after Ukrainian forces shelled the Russian-controlled city of Donetsk in eastern Ukraine, Alexei Kulemzin, the city’s Russian-installed mayor, said on Sunday. There was no immediate comment from Ukraine on the incident. According to Kulemzin, Ukrainian forces shelled a busy area where shops and a market are located. Reuters photographs taken at the scene showed crying people and bodies lying on a snow-covered street near one of the city’s markets. Pushilin said emergency services were working at the scene and that forensic specialists were …