The Twitter updates written by Benedict XVI on the Pontifex account have been deleted.
The Twitter account is now titled "Sede Vacante", the Latin phrase for "the seat being vacant".
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The talks descended into crisis on Friday when Canada's trade minister Chrystia Freeland walked out of meetings.
Police in New York are still investigating what the substance is and whether it could be harmful.
The Sherlock actor made the comment while he received an award for his humanitarian work.