Seven people were killed as a result of a fire that broke out Thursday on the seventh floor in a residential building in the city of Nice, according to local fire service in France.The causes of the fire which broke out in a popular area of the city are still unknown.Despite the great efforts made, seven people were killed, fire service said.One person, in a serious condition, was taken to the hospital, two others were moderately injured, and 33 other people were transferred to a safe place.Source: Qatar News Agency