PM: Chemical weapon use 'is ordered by Assad regime'

British experts at the Porton Down chemical warfare testing establishment have been involved in the assessment of samples taken from two sites in Syria, the Prime Minister said.

"We believe that the scale of use is sanctioned and ordered by the Assad regime," he said.

"We haven't seen any credible reporting of chemical weapons use by the Syrian opposition."

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PM: Drive Syria extremists out

David Cameron said he wants to see al Qaeda-linked extremists "driven out" of Syria. His comments came as Egypt's President Mohammed Morsi told a gathering in Cairo that his country has cut all diplomatic ties with Syria.