News Anchor: Welcome to the BBC News Desk. We have breaking news of a serious incident between Russian and NATO forces near the coast of Latvia. Although the details are uncertain, early reports indicate that a Russian surveillance aircraft was fired upon by naval vessels of NATO forces operating in that region, after apparently straying into Latvian sovereign airspace. It's unclear at this stage whether the Russian aircraft was shot down or not. This incident comes in the wake of a similar event some time ago; in which two Russian pilots were killed after being shot down by Turkish surface-to-air missiles, near the border with Syria. It's not known what caused this latest incident, or at exactly what time the conflict took place, but it is believed that it happened earlier today, and that Russian forces have returned fire. The government has convened a meeting of the emergency COBR Committee and senior members of the British Military have been seen entering 10 Downing Street. There were chaotic scenes earlier today as Prime Minister Theresa May was rushed back to Downing Street, as details of the international crisis began to emerge. She had been due to attend a meeting with senior business leaders in the city today, followed by a cross-party governmental committee meeting on electoral reform, but these plans have been cancelled in light of current developments. A government spokesperson said that no statement will be issued until the situation becomes clearer.