With continual shelling, UN observers’ mission is hampered because of attacks aimed to derail them from doing their work. The six-point plan issued by Kofi Annan, which is aimed to call for an immediate cessation of fighting, first by the Syrian government then the opposition.
Raising safety concerns is UN general Mood of Norway, he feels the observers are at a disadvantage because they are unarmed, and also that these attacks are clearly directed at them by armed groups. Hence going through with the mission, will put his men in danger.
Talks are underway whether the UN mission should be suspended until it is safe to go back again.