Two children were killed on Saturday when their western Gaza City house caught fire.Health Ministry spokesman Ashraf al-Qodra said the two children - both 3 years old - were killed when a major fire erupted in their house.He added that the father of one of the two children was also injured in the blaze.The fire was caused by a candle that was used by house residents after an electricity outage in the area, according to civil defense spokesman Mohamed al-Medeyah.The Gaza Strip has been suffering from an electricity crisis for about seven years now after Israel attacked its only functioning electricity generation station in mid-2006.In January 2013, the six members of a family were killed when their Gaza City house caught fire as well.The fire was caused by a candle the family used to get light after an electricity outage.