Syrian forces shoot up bus, U.N. derided

BEIRUT (Reuters) - Syrian security forces shot dead four civilians on a bus in the northern province of Idlib on Wednesday, dissidents said, as international pressure built on Damascus to honour U.N.-backed ceasefire pledges to order soldiers and tanks back to barracks. In the latest violence to undermine the flaky 13-day-old truce, the British-based Syrian Observatory for Human Rights (SOHR