Turkey ordered all Syria's diplomats Wednesday to leave the country within 72 hours following the massacre of more than 100 civilians in Houla, the foreign ministry said.

"As the host country, it has been demanded... that Syria's charge d'affaires in Ankara and all other diplomatic personnel leave our country within 72 hours as of May 30, 2012," the ministry said in a statement.

"It is out of the question for us to remain silent and not respond to this action which constitutes a crime against humanity."

Syria's charge d'affaires was summoned to the Turkish foreign ministry on Wednesday and notified of the government decision, the statement added.

On Tuesday, Western powers including the United States, Britain, France and Australia all kicked out the highest ranking Syrian diplomats in their countries in a bid to increase pressure on President Bashar al-Assad's regime.

The coordinated expulsions followed mounting international outrage over the massacre in the central town of Houla, in which at least 108 people, including 49 children, were killed, according to UN figures.

Turkey, once a strong ally of Syria, broke with Damascus after Bashar al-Assad's regime began cracking down on dissent in mid-March last year.