Britain has formally called for chemical weapons inspectors to be given urgent access to the site of a deadly toxic agent attack in Syria that is claimed to have left more than 1,300 dead.
The UK is among 37 countries that have written to the United Nations secretary general (Ban Ki-moon) to call for access to the site on the outskirts of Damascus following the attack.
Opposition leaders say 1,300 died when rockets loaded with toxic agents landed on the outskirts of Damascus, and footage claiming to show victims including children has circulated widely on the internet.
Bashar Assad's government denied the claims as "baseless" as a UN inspection team was beginning work assessing previous claims of chemical weapons use.
A Foreign Office spokesman said: "The UK along with 36 other countries has written to the secretary general formally referring this incident to the UN and calling for the UN team to be granted the necessary access to enable their investigation into these latest allegations as a matter of urgency."