The comments by Iraqi Foreign Minister Hoshyar Zebari reflect Iraq's fears that the Syrian conflict is imperiling its fragile domestic security, as well as growing international alarm about the risk posed by waves of foreign fighters bolstering the ranks of armed groups fighting to Syrian President Bashar Assad.
Zebari told attendees at a security conference in small Gulf island kingdom of Bahrain that the increase in radical fighters among the Syrian rebels is leading toward the creation of an ungovernable "Islamic emirate" that the world will have to deal with down the road.
"These are armies of recruits," he continued. "They're not all Syrians. There are European nationals. Some of them have come as far as from Australia, from Canada, and from many other countries. This is really toxic."
The 11 western European countries with the biggest contingents in Syria are estimated to have some 1,200-1,700 people among rebel forces, according to government and analyst figures compiled by The Associated Press. Many others are thought to come from Arab and other Muslim countries.
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It has recruited significant numbers of foreign fighters and has repeatedly clashed with more moderate groups within the Syrian opposition.
The cross-border movement of fighters is believed to have contributed to a months-long spike in bloodshed in Iraq, blamed largely on al-Qaida's local franchise, with more than 8,000 people killed in car bombings and other violent attacks since the start of the year.
"The day will come, God forbid, when they will have another Islamic emirate" outside the effective control of the government. "Then we have to deal with that threat later on.