The Syrian government presents the June 3 polls, in which President Bashar Assad is widely expected to secure a third seven-year term, as a means to end the 3-year-old conflict that has killed more than 160,000 people.
The Syrian opposition and its Western allies have denounced the vote as a farce aimed solely at lending Assad a veneer of electoral legitimacy.
Civilians have escaped the government-held northwestern city of Idlib, which is blockaded by rebels on three sides, after the Islamic Council, a military and civil body in rebel-held areas, ordered them to leave by midnight today. The city, besieged by rebels for more than two years, has witnessed frequent clashes.
"The opposition is preparing for a strike to disrupt the elections," Idilbi said via Skype.
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Members of the Islamic Council could not be immediately reached for comment.
Another activist based near Idlib named Bassil Asaad said thousands of people have fled, although he said he didn't expect a wide attack on Tuesday.
"I think it is only psychological warfare, although some rebels are warning they will turn it into a bloody day in Idlib," he said.
An amateur video posted online by activists showed scores of people, some on foot, moving in a rural area outside the city. The video appeared genuine and matched Associated Press reporting of the event.