Isis has claimed responsibility.http://www.independent.co.uk/news/world ... 46136.html
A retaliation for Belgium's role in the conflict which was miniscule to be frank. ISIS cheered prior to the attack at their own compounds in Syria and Iraq.
Assad has said it's Belgium's fault for "tolerating terrorism to achieve certain agendas", which is hypocritical given that he has relied on Hezbollah and Iraqi shia terrorist groups for3 years now.
Based on this it is safe to assume that France and Belgium are being targeted not because of their involvement ( I don't understand how Belgium has severely hampered ISIS militarily or tolerated terrorism to achieve agendas because it's not in any way relevant when determining the overall policy of the EU on Syria and the US on Syria) but because of the high degree of radicalization per capita in Belgium and the number of fighters and cells originating from there.
I on the other hand seem to have a cold.