A Russian helicopter was shot down on Monday after providing assistance in the Syrian city of Aleppo, killing all five crew members on Board which, according to Russian state media. The Russian defense Ministry said the Mi-8 helicopter was shot down by anti-aircraft fire in Idlib province, when he flew to the base, according to state television. "Those who were on Board the helicopter, according to the Ministry of defence, heroically died because they tried to send the car to the other side, to minimize losses on the ground," said state news Agency Sputnik. The helicopter was shot down in the territory of the deadly fighting in Eastern Aleppo, where the rebels are trying to break the blockade of the Syrian government's five-year civil war in the country. The United Nations warns of a potential humanitarian catastrophe in Aleppo. According to UN estimates, from 200 000 to 300 000 people remain trapped in rebel-held parts of Eastern Aleppo. The Syrian and the Russian government has prepared three humanitarian corridor which was opened to ensure the distribution of essential food and medical assistance to the civilian population and provide residents - along with the rebels who decided to surrender - they have the opportunity to leave. The Syrian government announced a General Amnesty for rebels who surrender before the state government within three months. 169 civilians and 69 militants who were offered Amnesty ran over the weekend in the corridors, said Russian military official. Russia says that it produced 14 tons of humanitarian cargo for those leaving the city and 2.5 tons of food and other necessities. The United Nations called for a 48-hour cease-fire to deliver much-needed humanitarian assistance into the city, where most of the people suffer from malnutrition and medical supplies are depleted.