US ambassador to the UN, Nikki Haley, spoke in a group of some 20 ambassadors from US allies who are boycotting the negotiations, including Britain, France and South Korea, Turkey and a number of countries from eastern Europe.
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Just a day before Britain kick-starts Brexit proceedings, the Scottish parliament is on Tuesday expected to dismiss Prime Minister Theresa May's overtures and back calls for a fresh independence referendum.
British police said there was no evidence that Masood had been radicalised in prison in 2003 and it was pure speculation to suggest that had happened.
US ambassador to the United Nations, Nikki Haley, was addressing the annual American Israel Public Affairs Committee (AIPAC) policy conference for the first time since President Donald Trump named her Washington's UN envoy.
The British government gave Northern Ireland's main parties extra time to form a power-sharing government after a deadline to resolve their bitter differences expired just two days before the launch of Brexit.
Operations are currently focused on the strategically important town of Tabqa on the Euphrates River, and the adjacent dam and military airport.