The White House has insisted that there is “no evidence to substantiate the charge that Syrian opposition has used chemical weapons”.
US President Barack Obama has again warned of the “consequences” should chemical weapons be used in Syria.
The White House said it was “looking carefully” at the allegations.
More top news
The Plaza de Margaret Thatcher in the centre of Spain's capital has received a mixed response from politicians in the country.
An app has been launched to help potentially terrified people identify invading house spiders that scurry indoors in the autumn.
The level of abuse and even intimidation by some in the ‘Yes’ campaign is making this referendum a rather unpleasant experience.