The judge at St Albans Crown Court sentenced Collins to carry out 140 hours unpaid work within the next 18 months. He was also ordered to pay £3,500 in prosecution costs.
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Among those murdered was Keith Palmer, an unarmed constable who "did his job and never wanted any fuss."
Top temperature 14 Celsius (57 F).
The Prime Minister will say Moscow's brazen flouting of international law represents a threat to the basis of democracy across Europe.