The U.S. ambassador to Canada was mailed a package containing a death threat and white powder on Thursday, Bloomberg reported.

The package contained a letter with a death threat against Kelly Craft, President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and members of Trump’s family, an official told Bloomberg.

The package was addressed to the Craft at the U.S. Embassy in Ottawa but was discovered by a mailroom employee at Craft’s residence, an embassy official told Bloomberg.

The police were then contacted and tests determined that the white powder was not harmful, Bloomberg reported.

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Canadian Prime Minister Justin Trudeau called Craft on Friday to offer support.

The incident comes amid high tensions between Trudeau and Trump after Trump called the prime minister “dishonest and weak” following a contentious Group of Seven (G-7) meeting in Canada.

Trump refused to sign on to a communique that all other G-7 nations endorsed at the end of the summit.

After the summit, White House trade adviser Peter Navarro said during a Fox News interview that there is a “special place in hell” for Trudeau, a comment he has since apologized for.

Trump had recently implemented a 25 percent tariff on steel and a 10 percent tariff on aluminum imported from, among other nations, Canada.

Canada has announced dollar-for-dollar retaliatory measures against U.S. goods, increasing the possibility of a trade war with one of the U.S.’s closest allies.