Jordan today expelled Syria's ambassador over his "repeated insults" to the kingdom, drawing a swift tit-for-tat response from Damascus, which ordered Amman's top diplomat to leave.
On the battlefield, Syrian rebels made advances in the war-torn country's northwest, seizing several army checkpoints and inching closer towards taking over two major bases, according to a monitor and activists said.
In Amman, Jordanian foreign ministry spokeswoman Sabah Rafi said the government "considers the Syrian ambassador to Jordan persona non grata and has demanded he leave the country within 24 hours."
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Rafi said the government in Jordan, which is hosting hundreds of thousands of refugees from the conflict across its borders, had "repeatedly warned Suleiman not to exploit Jordanian hospitality."
"Suleiman used Jordan as a platform to question its positions and make false accusations and allegations against the kingdom," she said.
"He also used Jordan to directly insult brotherly and neighbouring Arab countries and insult their leaderships."
In response to the Jordanian move, Syria said it was kicking out the Jordanian charge d'affaires in Damascus.
"The Syrian foreign ministry will order the expulsion of the Jordanian charge d'affaires to Damascus," said state TV channel Al-Ikhbariya.
It quoted the foreign ministry saying the decision came "in response to the Jordanian government's baseless decision to declare the Syrian ambassador to Amman persona non grata."
Jordan recalled its ambassador to Syria, Omar al-Amad, in early 2011 after pro-Syrian regime protesters attacked Amman's embassy in Damascus.
Last June, Jordanian Foreign Minister Nasser Judeh told Suleiman to stop criticising the country or risk expulsion.
The warning came after Suleiman attacked Jordan for hosting a meeting of the anti-regime "Friends of Syria" group, which includes Jordan, calling it "a meeting of Syria's enemies".
He also sharply criticised Jordan after the United States decided last year to send the kingdom a Patriot missile battery, F-16 fighters and troops to counter the threat posed by Syria's civil war.
He has in the past described the estimated 600,000 Syrian refugees in Jordan as "terrorists.