Syria’s opposition seeks to unite.

Syria's divided opposition groups are due to meet in Turkey to try to draw up a "national pact" how to unseat President Bashar al-Assad's government, according to BBC.

The main opposition movement, the Syrian National Council (SNC), says all other anti-Assad groups have been invited to the gathering in Istanbul.

The opposition has been weakened by internal disputes, losing support of many Syrians fighting the government.

Russia has said it backs UN envoy Kofi Annan's peace mission in Syria.

Mr Annan has proposed a six-point peace plan, which calls on government forces to immediately halt the use of heavy weapons in populated areas. He also wants the armed rebels to halt their attacks.

Clashes continued across Syria on Sunday, with Human Rights Watch accusing government forces of using civilians as human shields.