Britain's foreign secretary says the U.K. won't rule out the use of an international military intervention in Syria to end the violence there.
Hague told lawmakers on Monday that Britain was focused on diplomatic efforts, but would "not rule out any other option which could at any stage stop the bloodshed."
He said Syrian President Bashar Assad's regime was "attempting with utter inhumanity to sow terror" among its opponents.
Hague said there was also credible evidence of human rights abuses and sectarian attacks by opposition fighters, and signs that al-Qaida-affiliated groups had carried out attacks "designed to exacerbate the violence."
He urged Russia to use its leverage with Assad, and warned that Moscow's plan for an international conference could risk buying "time for the regime to kill more innocent people."