President Assad called for a reconciliation conference with "those who have not betrayed Syria", to be followed by the formation of a new government and an amnesty.
The first stage of a political solution would require that regional powers stop funding and arming (the opposition), an end to terrorist operations and controlling the borders.
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The operation to recover the unexploded bomb near the Houses of Parliament let to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
A police spokesman said the incident in the Bourke Street Mall on Friday was not related to terrorism.