London Telegraph 
May 31, 2012
In a statement, the main rebel group said they would abandon the truce unless the ultimatum was met.
“If the Syrian regime does not meet the deadline by Friday midday, the command of the Free Syrian Army announces that it will no longer be tied by any commitment to the Annan plan … and our duty will be … to defend civilians,” it said.
The ultimatum followed reports by the UN of two massacres of civilians in the past week, leaving an April 12 ceasefire negotiated by UN-Arab League peace envoy Kofi Annan in tatters. The former UN Secretary General visited Damascus this week in a vain effort to reinforce the plan.
More than 100 people died, including 49 children and 34 women, in the central town of Houla.
Some were blown to bits by artillery and tank fire but most were summarily executed, according to the UN High Commissioner for Human Rights.