Twin car bombs killed at least 22 people in the Syrian city of Idlib on Wednesday, as universities nationwide held a day of mourning for 87 people killed in explosions on the student campus in Aleppo, AFP reported.

The bombings had the hallmarks of operations staged by the jihadist Al-Nusra Front, a rebel group which has a strong presence on the ground in northwestern Syria and is blacklisted by the United States as a "terrorist" organization.