Syrian activists say at least 21 people have been killed by government forces, during a visit by UN observers to a town in Idlib province.<br /><br />The activists say soldiers opened fire on a funeral procession in the town of Khan Sheikhoun on Tuesday.<br /><br />The UN has confirmed that several of its vehicles were damaged by an explosion during their visit.<br /><br />Al Jazeera's Laurence Lee reports.
