Venus begins to pass in front of the sun, as visible from New York during the transit of Venus.
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An inquiry will be carried out by the Aircraft Accident Investigation Bureau.
President Michel Aoun, in office since 2016, said he was first told of the dangerous stockpile nearly three weeks ago.
Taoiseach Micheal Martin announced new restrictions for counties Kildare, Laois and Offaly following a surge of coronavirus cases.