Syrian rebels battled President Bashar al-Assad's forces in and around the northern city of Aleppo on Sunday, seeking to reverse gains made by loyalist forces in the commercial hub over the last two months, activists said. The fighting, by a variety of insurgent groups, happened as France urged moderate rebels to wrest territory back from radical Islamists whose role in the fight to topple Assad poses a dilemma for Western countries concerned that arms shipments could fall into the hands of people it considers terrorists. The 11 Western and Arab countries known as the "Friends of Syria " agreed on Saturday to give urgent military support to the rebels, channeled through the Western-backed Supreme Military Council in a bid to prevent arms getting to Islamist radicals. But radical forces showed they remained formidable on Sunday when the Islamist Ahrar al-Sham brigade detonated a car bomb at a roadblock at an entrance to Aleppo killing at least 12 loyalist soldiers, a