Syria suggests it might not pull forces by deadline NEW: A foreign official says Syria wants assurances that armed groups will turn in weapons NEW: At least 12 people are killed in Syria on Sunday, an opposition group says NEW: Syria says 6 army and law enforcement "martyrs" were buried Sunday (CNN) -- Syria will not commit to pulling armed forces from cities only to have "armed terrorist groups" commit attacks, a Syrian foreign ministry spokesman said Sunday. The comments, made by Jihad Maqdisi on state-run TV, came two days before a Tuesday deadline for regime forces to withdraw from cities, which the government had agreed to as part of a peace plan laid out by U.N.-Arab League special envoy Kofi Annan. But "Annan did not give written assurances that the armed groups would turn in their weapons," Makdissi said. Annan has said he expects rebel fighters to also cease fire after the Tuesday deadline, but the deadline itself was for regime forces to withdraw from cities. "Syria will not repeat what happened during the (Arab League) mission, when it committed to the exit of its armed forces from the cities and surrounding areas, then the armed terrorist groups took advantage to arm its members and conduct all forms of terrorism," Makdissi said, referring to an Arab League monitoring mission that took place several months ago. Throughout the more than year-long uprising against the regime, the Syrian government has consistently blamed violence on "armed terrorist groups." But U.N. and other world leaders have said the government is engaged in a violent crackdown. Reports from Syrian opposition activists suggest government forces are slaughtering civilians in an attempt to wipe out dissidents seeking President Bashar al-Assad's ouster. Rebel fighters have taken up arms, but their strength has often paled in comparison to the better-equipped regime troops. At least 12 people were killed in fresh violence across the country Sunday, according to the Local Coordination Committees of Syria, a network of opposition activists. The deaths included three in Hama; four in Homs; two in Deir Ezzor; two in Idlib, and one in Aleppo. The group also said at least 127 people were killed on Saturday, including 59 deaths in Hama. The LCC said Syrian forces have been targeting civilians displaced from their homes by earlier fighting. Specifically, the LCC said, the regime is attacking villages and farms around the eastern city of Rastan, where fighting a month ago forced out more than 80% of residents. Syria said Sunday that the bodies of six "army and law enforcement martyrs" were buried. On Sunday morning, the state-run Syrian Arab News Agency made little mention of any new violence but showed images of packed demonstrations that it said took place a day earlier. We have seen people beheaded, children killed, bodies torn apart, and nothing surprises us anymore," Saleem said Saturday. Annan's six-point plan for Syria includes calls for a cease-fire by both sides and a Syrian-led political process to end the crisis. CNN's Ivan Watson, Kareem Khadder, Samira Said, and Salma Abdelaziz contributed to this report.