The deadly explosion in southern Beirut took place "meters away" from Hezbollah's political council, local news station LBC International said.
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The intervention of a candidate in a Canadian election by a former US president is extremely rare.
Negotiations look set to go down to the wire.
Negotiators have until dawn on Thursday to agree on a Brexit plan or it will not be debated at an EU summit, Mairead McGuinness has said.