Ayan Hadi, the wife of convicted terrorist Richard Dart, has been sentenced to 12 months imprisonment suspended for two years for failing to provide information that might have helped in his arrest and prosecution. She was also given a supervision order.
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Police have stepped up patrols after a woman in her 40s was "dragged to the ground" in a park in east London.
Families living near Heathrow say they are supporting a group of activists facing jail for chaining themselves to the airport's runway.
Police were called to break up a "large fight" which involved a baseball bat, a man dislocating his shoulder and three arrests.