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Prime Minister David Cameron discussed the situation in Syria with President Obama and Prime Minister Harper.
A Downing Street spokesperson said:
The Prime Minister and President Obama discussed the situation in Syria this afternoon.
They are both gravely concerned by the attack that took place in Damascus on Wednesday and the increasing signs that this was a significant chemical weapons attack carried out by the Syrian regime against its own people. The UN Security Council has called for immediate access for UN investigators on the ground in Damascus. The fact that President Assad has failed to co-operate with the UN suggests that the regime has something to hide.
They reiterated that significant use of chemical weapons would merit a serious response from the international community and both have tasked officials to examine all the options. They agreed that it is vital that the world upholds the prohibition on the use of chemical weapons and deters further outrages. They agreed to keep in close contact on the issue.
The Prime Minister also spoke to Prime Minister Harper who agreed that the situation was extremely troubling and that the international community must respond appropriately.
Read more: Syria chemical weapons attack