President Cristina Kircher will lead a delegation of more than 90 diplomats and officials to address the annual meeting of the UN decolonisation committee on the Falklands and 15 other territories. She will be the first head of state to address what is a relatively low-level UN Committee.
She is expected to argue that the islands, known as the Malvinas in Argentina, are still important to the people of Argentina, and that the UK should "stop ignoring" the work of the UN committee and sit down to proper negotiations on their future.
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Police said the "active shooter", reportedly a lawyer, had since been shot by officers and they were not seeking any other suspects.