Sinn Fein's Deputy First Minister Martin McGuinness said all threats against democratically elected representatives should be withdrawn immediately.
There is no justification for this type of intimidation from any grouping or organisation
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An ejector seat manufacturer is to be prosecuted over the death of Red Arrows pilot Sean Cunningham at RAF Scampton in November 2011.
Police said the "active shooter", reportedly a lawyer, had since been shot by officers and they were not seeking any other suspects.