US President Joe Biden on Sunday said deposed Syrian leader Bashar al-Assad should be "held accountable" but called the nation's political upheaval a "historic opportunity" for Syrians to rebuild their country. In the first full US reaction to Assad's overthrow by an Islamist-led coalition of rebel factions, Biden also warned that Washington will "remain vigilant" against the emergence of terrorist groups, announcing that US forces had just conducted fresh strikes
