Syrian rebels kill at least 20 with tunnel bomb in Aleppo - where 2,000 have died since January
In early May, rebels also used bomb-packed tunnels to level a historic hotel in the Old City of Aleppo that was being used as an army base.
It is a flashpoint area that sees daily fighting, and the army has set up multiple positions there.
Such explosions have provided a reminder that the rebels, despite setbacks in other parts of the country, remain a potent force.
Now in its fourth year, Syria's conflict has killed more than 160,000 people and caused a humanitarian crisis.
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