Syria to U.N.: 'Serious fear' it will be framed for the use of chemical weapons December 10, 2012 -- Updated 1327 GMT (2127 HKT) Syria's Foreign Ministry has written two letters to the United Nations, state-run media says The letters outline the government's fear that the United States will try to frame it Syria cites recent media reports about the possible use of the weapons At least 7 people have been killed Monday in fighting across Syria, the opposition says (CNN) -- Syria is raising concern in two letters to the United Nations that the United States may be attempting to frame it for the use of chemical weapons, Syrian state-run media reported Monday. The letters, addressed to U.N. Secretary-General Ban Ki-moon and chairman of the Security Council, repeated Damascus' previous pledge that it would not use chemical weapons, if it were in possession of them, in its ongoing violence. The move by President Bashar al-Assad's government follows recent reports that Syrian forces appear to have begun preparing chemical weapons for use. The United States and other nations have warned that the use of such weapons by al-Assad's forces is a "red line" that would prompt a swift international response. "The U.S. administration has consistently worked over the past year to launch a campaign of allegations on the possibility that Syria could use chemical weapons during the current crisis," the Foreign Ministry wrote in the letters, according to the state-run Syrian Arab News Agency (SANA). The letters, which were delivered Saturday, cited recent media reports about the possible use of the weapons, according to SANA. "What raises concerns about this news circulated by the media is our serious fear that some of the countries backing terrorism and terrorists might provide the armed terrorist groups with chemical weapons and claim that it was the Syrian government that used the weapons," the letters said. News of the letters to the United Nations also follows a CNN report that the United States and some European allies are using defense contractors to train Syrian rebels on how to secure chemical weapons stockpiles in Syria. The report, which cites a senior U.S. official and several senior diplomats, said the training is taking place in Jordan and Turkey, and involves how to monitor and secure stockpiles and handle weapons sites and materials, according to the officials, who spoke on condition of anonymity because they were not authorized to publicly discuss the issue. Some of the contractors are in Syria working with the rebels to monitor some of the sites, one of the officials said. The nationality of the trainers was not disclosed, though the officials cautioned against assuming all are American. Syria has been under enormous international pressure to end a more than 21-month civil war that has left tens of thousands dead. Al-Assad has refused to acknowledge the civil war, claiming his forces are battling "terrorists" backed by foreign countries bent on destabilizing Syria. News of the letters came the same day that the opposition reported fighting across Syria, including the capital city of Damascus and the flashpoint city of Homs. At least seven people were killed in clashes, including a woman and two children killed by shelling in a Damascus suburb, the Local Coordination Committees of Syria said. CNN is unable to confirm casualty reports as the government has severely restricted access by international journalists. CNN's Elise Labott and Samira Said contributed to this report. December 8, 2012 -- Updated 1950 GMT (0350 HKT)