• BREAKING NEWS ABC shows live and on-demand -- Download the WATCH ABC app!

Syria conflict: Kofi Annan calls for new strategy to end violence

A damaged building in Houla, Syria is seen in this undated photo. On Friday, May 25, 2012, an assault in the area left more than 90 people dead.

June 7, 2012 12:00:00 AM PDT
International envoy Kofi Annan is calling on world powers and other regional players, including Iran, to come up with a strategy to end the 15-month conflict in Syria.

Britain's Prime Minister David Cameron is also urging action from the international community against Syrian President Bashar Assad's regime, following recent reports of attacks on civilians. The Syrian government claims terrorists are responsible for the attacks, not government forces.

The United Nations says its monitors were blocked Thursday from the site where the opposition claims regime forces slaughtered at least 78 people.

The violence comes on the heels of a horrific massacre last month in Houla, which left over 100 dead, including many women and children gunned down in their homes.

Violence in Syria has grown increasingly chaotic in recent months, and it is difficult to assign blame for much of the bloodshed. The government restricts journalists from moving freely, making it nearly impossible to independently verify accounts from either side.

The Associated Press contributed to this report.