Hezbollah vs FSA: 'Bloodbath looms in Lebanon as Syria war spills over'

A powerful blast has struck the Syrian capital - killing 31 people and injuring dozens more. The explosion also caused severe damage - shattering windows and sending a cloud of smoke above the city.It comes as the Free Syrian Army opposition group has given Hezbollah a 48-hour deadline to stop shelling its locations from neighbouring Lebanon. Middle East expert Tariq Ali shares his opinion with RT.