RIYADH, (DNA) – For years, Canadian pressure on human rights in Saudi Arabia had elicited no more than a standard rejection. But all that changed last week, when a Canadian complaint was translated into Arabic and set off a diplomatic row.

When Riyadh responded to a call from Canadian Foreign Minister Chrystia Freeland to release civil society activists with an abrupt severing of diplomatic and trade ties, Canadian officials were left scrambling to understand what had happened.

What Ottawa did not anticipate was that in the eyes of the Saudis they had crossed a red line.

On Aug. 2, Freeland tweeted here in English and French, calling for the release of two jailed Saudi human rights activists. The following day, Canada’s foreign affairs department sent another tweet here, urging Saudi Arabia to “immediately release” those and other activists.

The reaction from Saudi Arabia was swift. Hours after the Arabic tweet, the Saudi government recalled its ambassador, barred Canada’s envoy from returning and placed a ban on new trade.

Two Gulf sources said it was the tweet from the embassy that upset Saudi officials the most.

“Matters were being handled through usual channels but the tweet was a break with diplomatic norms and protocol,” said one of the sources, speaking on condition of anonymity because of the sensitivity of the issue.

The sources did not clarify exactly how the tweet broke with diplomacy, but regional experts said it was the step of sending it to a domestic audience that would have angered Saudi officials.

“The Saudi retaliation took some time to allow for political talks in closed doors,” Salman al-Ansari, founder of the Washington-based Saudi American Public Relation Affairs Committee, said.

“They thought the Canadians would take steps to back off, but all of a sudden they tweeted it in Arabic. This was a very provocative action by the Canadians to try to embarrass the Saudis in front of their people. The Saudis did not take this lightly at all.”

Saudi Foreign Minister Adel Jubeir raised the issue of the Arabic tweet in a call with Freeland on Tuesday, and complained about interference, a person familiar with the matter who declined to be named said.

Canadian officials say there was nothing remarkable about the Arabic tweet, which merely repeated Ottawa’s stated position in a common practice for delegations abroad.

Canada has raised the issue of civil society activist detentions before. As recently as May, Canada’s Riyadh embassy tweeted in English its concern about activist arrests and said it was “crucial that the rule of law” be respected, with no public Saudi response.