Police in Milwaukee say they have killed an "active shooter" at the scene. A police spokesperson told the Associated Press that six people had been shot inside the temple.
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James Ward, a 65-year-old from Scotland, allegedly defrauded investors.
A woman and two men also suffered serious injuries and are being treated in hospital in Sligo.
The comedy star revealed in 2013 that he was being treated for the initial symptoms of Parkinson’s disease.