The British government lost a 2013 parliamentary vote over plans to bomb the forces of Syrian President Bashar al-Assad, but has been involved in bombing raids against Islamic State in Syria since winning the support of lawmakers last December.
Earlier on Thursday Foreign Secretary Boris Johnson said Britain was looking again at its military involvement in Syria but any action would need to be part of a coalition involving the United States and is not likely to happen soon.
"There are no plans for military action. We are working with the international community to look at how to bring the conflict to an end," May's spokeswoman said when asked about Johnson's comments, adding that there were a range of options available.
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