The Sharia LAW of Muslim countries I guess. This had been discussed in the forum for a while I see no reason for the Bitcoin ban this time since it's been regulated already. China use to ban Bitcoin but it had changed now.
Most countries will just follow what US is doing so if US isn't banning BTC, it's likely not going to be banned also to most countries.
Bitcoin is a virtual payment system that is not controlled or regulated by any central government or private institution. Participants in the Bitcoin system can easily hide their identities, and the government cannot control the domestic economy. Many criminals commit crimes through anonymity (money laundering).