Police in riot gear, supported by an armoured SWAT vehicle and a helicopter overhead, repeatedly ordered a crowd to disperse in Ferguson, Missouri.
They then fired a volley of tear gas just after 11pm (5am UK time), sending the crowd fleeing, it was reported.
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Theresa May is to make the announcement during talks in Berkshire with President Emmanuel Macron on Thursday.
Research carried out in December revealed 86% of surveyors reported no increase in first-time buyer inquiries following the changes.
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