Alex Salmond has demanded an apology from David Cameron for failing to tell Scottish ministers about a radiation problem at a nuclear submarine test reactor.
The First Minister said the UK Government had "disrespected" Holyrood and the people of Scotland by not alerting the Scottish Government to the problem for almost two years.
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Joshua Clements stabbed two 19-year-olds while 4,000 people were gathered at the royal park.
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The US secretary of state called for a new approach to resume talks amid the civil war, including unity government and transfer of weapons.