Police have fired water cannon and tear gas to disperse a crowd of several thousand protesters in the Turkish town where 284 people were killed in a mining disaster.
A Reuters witness said people scattered into side streets as police moved in after a stand-off on a shopping street in Soma, which also included the offices of the local government and labour union.
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The PM will sound out the possibility of new free trade agreements with Gulf states for once the UK has left the EU.
In the unexpected announcement on Monday, Mr Key said it was the "right time" to leave politics.
As the Government's Brexit appeal comes to the Supreme Court, here's a look at what you need to know.