Iran's parliamentary speaker cancelled on Saturday a visit to Canada to protest Ottawa's decision to cut diplomatic relations, and Tehran's foreign ministry called "unwise" a five-day deadline set by Canada for Iranian diplomats to leave the country.
Canada shut its embassy in Tehran on Friday accusing the Islamic Republic of being the most significant threat to world peace. The surprise action reinforces the Conservative government of Prime Minister Stephen Harper's close ties with Tehran's arch foe Israel.
To protest the cutting of ties, Iran's parliamentary speaker Ali Larijani decided not to attend a meeting of legislators from different countries scheduled for late October, Fars news agency said.
Tehran's Foreign Ministry meanwhile said that Ottawa's five-day deadline for its diplomats to leave was "unwise." It said Canada cut relations in an "unprofessional, unconventional, and unjustifiable manner while resorting to misusing international law."
Iran accused Canada on Saturday of "hostile behaviour" under Israeli and British influence after and it raised the prospect of swift retaliation.
Ottawa cited Iran's disputed nuclear work, which Western states see as a disguised effort to develop atomic bombs, its hostility toward Israel and alleged military aid to Syrian President Bashar al-Assad, who is battling a popular uprising.
Iranian Foreign Ministry spokesman Ramin Mehmanparast said the Canadian move was a "continuation of anti-Iranian policies" by Prime Minister Stephen Harper's Conservative government, which has long had poor relations with Tehran.
"The current government of Canada under the leadership of Mr Stephen Harper is known for extreme policies in the domain of foreign policy," Mehr news agency quoted Mr. Mehmanparast as saying.
"The hostile behaviour of the current racist government in Canada in reality follows the policies dictated by the Zionists (Israel) and the British."
The Jewish state is Iran's arch-enemy, while Britain expelled Iranian diplomats late last year after radical Iranian protesters sacked its embassy in Tehran.
Alaeddin Boroujerdi, who heads Iran's influential parliamentary committee on national security and foreign policy, said there could be an "immediate and decisive" response to Canada's action, Fars news agency reported.
"It is essential that the foreign ministry respond to this action by Canada on the basis of national interests."
Canada's 10 diplomats in Iran have already left Tehran, the Canadian foreign ministry said on Friday.
Western states led by the United States believe Iran is covertly trying to develop nuclear weapons capability, though Iran states its uranium enrichment work is wholly peaceful, aimed at generating electricity and medical isotopes.
Mr. Mehmanparast said the Canadian move was an attempt to nullify Iran's diplomatic success in hosting a summit of Non-Aligned Movement developing countries last month, which he said Canada had tried to scuttle.
He said Canada's anti-Iranian policies included a ban on money transfers for Iranian students studying in Canada and the blocking of the bank accounts of ordinary Iranians as a result of Western sanctions imposed on Iran's banking sector.
There is a large Iranian diaspora in Canada, with more than 120,000 people reporting Iranian ethnic origins.
The government's move generated criticism in Canada Friday as well.
New Democrat Foreign Affairs critic Paul Dewer called the move bizarre and irresponsible. He said the decision has removed Canada as a potential player in soothing tensions in the Middle East.
Mr. Dewer said it might be good rhetoric but it is not good diplomacy.
Ottawa's bilateral relations with Tehran deteriorated markedly in 2003, when Iranian-Canadian photojournalist Zahra Kazemi died in Tehran's Evin prison while in custody.
The closure of Ottawa's Tehran mission is the most significant row between Iran and another country since the ransacking of the UK embassy, which British officials said could not have happened without some level of government consent.
The United States has not had a functioning embassy in Tehran since the 1979-81 hostage crisis, when 52 Americans were held for 444 days.
With a report from The Associated Press