AL-BAB, Syria (Reuters) - Syrian rebels who drove Islamic State from the town of al-Bab in northwest Syria this year discovered an extensive network of tunnels dug by militants as part of their defences, a tactic that has slowed the military campaign against them.
"The tunnels complicated the fighting a lot and stopped our advance for weeks," said Mohammed Abu Yousef, a rebel in a group fighting under the banner of the Free Syrian Army as part of a Turkey-backed military campaign in north Syria.
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