( CNN ) -- U.N. observers who were stranded overnight in a Syrian town after their convoy struck an explosive device have made it safely to the city of Hama , the United Nations said Wednesday . The six observers were in Khan Sheikhoun , part of Idlib province , when they were attacked , said Ahmad Fawzi , spokesman for U.N.-Arab League special envoy Kofi Annan . No U.N. personnel were injured in the explosion Tuesday , but three vehicles were damaged , Fawzi said . A bombardment by Syrian forces continues in Khan Sheikhoun , according to the opposition Local Coordination Committees of Syria . The regime is using `` all kinds of heavy weapons , the LCC said . Opposition activists reported another day of widespread violence in many parts of the country that left at least 15 people dead . Nine people died Wednesday in Khan Sheikhoun , according to the opposition Syrian Observatory for Human Rights . A child and a civilian were among them . Four died of wounds suffered Tuesday as government forces attacked the area , the group said . Three people , including a young girl , were killed Wednesday when government forces shelled a camp for displaced residents , opposition activists said . The camp in Daraa is for displaced Syrians from the Golan Heights , who were not fleeing violence from the current unrest in Syria , according to the observatory . Syria , on state-run news agency SANA , said 11 `` army , law enforcement and civilian martyrs '' were buried Wednesday . Also , 250 citizens `` who were involved in the recent events and whose hands are clear of the Syrian blood were released on Wednesday , '' SANA said . Syria blames the violence in the country on `` armed terrorist groups . '' SANA also reported that three terrorists -- one from Libya and two from Tunisia -- `` confessed that they infiltrated into Syria through the Turkish borders in order to carry out terrorist attacks in coordination with al Qaeda and militias of the so-called free army . '' The rebel Free Syrian Army has been battling regime forces . Opposition groups say President Bashar al-Assad 's government has been trying to mar their efforts with false accusations of links to terrorism . Syria has met their call for a new government and political reforms with a brutal , violent crackdown , opposition activists say . The LCC on Wednesday reported raids , the burning of homes , random arrests and more throughout the country . Ambulances were prevented from aiding the wounded in some places , the group said . The Tuesday attack on the U.N. convoy took place around the same time government forces fired on a nearby funeral procession , according to opposition activists . At least 23 people were killed and 100 were injured in that attack , said the opposition group Avaaz . The LCC described dozens of people falling to the ground after government forces fired on them using heavy machine guns . Videos posted on YouTube purported to show what happened . CNN can not confirm their authenticity . The United Nations estimates that at least 9,000 people have died in the 14-month crisis , while opposition groups put the death toll at more than 11,000 . CNN can not independently verify reports of deaths and violence because the Syrian government has severely restricted access by international media . Meanwhile , a Western diplomat confirmed to CNN that according to a confidential U.N. draft report , Iran is violating a Security Council ban on weapons exports and that Syria is the top recipient for those arms . The report , which was drafted by a panel of experts and submitted to the Security Council 's sanctions committee on Iran , describes three large seizures of Iranian weapons shipments within the year . The diplomat confirmed that report claims two of those seizures involved the Syrian Arab Republic . CNN 's Samira Said , Amir Ahmed and Joe Vaccarello contributed to this report .
Syria says three `` terrorists '' confessed . U.N. personnel stranded overnight in Ahmad Fawzi are back in Syria , the Free Syrian Army says . 250 people were killed Wednesday , opposition activists say . 250 arrested people were released , Hama says .