Over the past 24 hours a fierce battle has been raging for the last government controlled airbase in Aleppo, Syria. <br />Rebels claim that Hezbollah fighters have reached Aleppo and are fighting on behalf of Syrian President Bashar al-Assad. <br />At a press conference in the capital Damascus one Syrian opposition group says that all foreign fighters, both pro and anti-government, must leave the country.<br />The issue of foreign fighters in Syria was thrown in to sharp relief recently following the execution of a teenage boy accused of blasphemy.<br />Al Jazeera's Imran Khan reports.
