Four persons were killed and as many wounded as an unidentified gunman opened fire at people celebrating pancake week festival in Dagestan's city of Kizlyar on Sunday, media reports said."The incident took place in Kizlyar. According to preliminary data, four people were killed. Four more were wounded. The shooter was gunned down," a source in local law enforcement agencies told Tass.Kizlyar's Mayor Alexander Shuvalov told Tass: "People were leaving a church after an evening service when he opened fire at them."Four people were killed. The shooter was shot dead. Two police officers and a woman were wounded."