Police have made around 20 arrests after 2000 people gathered in Birmingham for an EDL rally and a counter Unite Against Fascism demonstration.
Some incidents of criminal damage and assault are still being investigated but police have said their operation was a success.
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He demanded the money after placing a carrier bag containing what appeared to be a heavy object on the counter.
Closures will be in place on the Aston Expressway, Park Circus and Salford Circus. There will be some full weekend closures and diversions.
West Midlands Police have said specially trained police negotiators are speaking with the woman to try and talk her down to safety.