Saudi Arabia said Monday it was expelling the Canadian ambassador and had recalled its envoy while freezing all new trade, in protest at Ottawa's vigorous calls for the release of jailed activists.

The kingdom gave the Canadian ambassador 24 hours to leave the country, in an abrupt rupture of relations over what it slammed as "interference" in its internal affairs.

The move, which underscores a newly aggressive foreign policy led by Crown Prince Mohammed bin Salman, comes after Canada demanded the immediate release of human rights campaigners swept up in a recent crackdown.

"The Canadian position is an overt and blatant interference in the internal affairs of the Kingdom of Saudi Arabia," the Saudi foreign ministry tweeted.

"The kingdom announces that it is recalling its ambassador to Canada for consultation. We consider the Canadian ambassador to the kingdom persona non grata and order him to leave within the next 24 hours."

The ministry also announced "the freezing of all new trade and investment transactions with Canada while retaining its right to take further action".