Source for this news? There is no law against bitcoin or other cryptocurrencies in Pakistan so it's not illegal. State bank can't crackdown on websites because that is not within it's purview. That's the job of the PTA. Cyber crime force (whatever that is) also can't act in the absence of a law banning bitcoin.
Like I said it is not illegal in Pakistan. FIA can only shake people down for bribes. Any such case won't hold up in a court of law because there is no law against it. Even the SBP's actions are limited to restricting banks from dealing with cryptocurrencies. You can still trade in cash and even use the banking system as long as the banks don't find out which is what most localbitcoin traders do.
Basically they can't create a law against bitcoin right now because it would be a disproportionate response:
1) It's too small for parliamentarians to care about. They are the ones that create laws in the country not SBP or FIA.
2) any such law will only attract attention to bitcoin which will widen its use in Pakistan especially since laws are generally not enforced in the country.
3) it's not illegal in foreign countries that are far richer than Pakistan so making it illegal in Pakistan will make it impossible to enforce the law even if you wanted to. You can simply buy from and sell to foreigners.
So instead of making it illegal they are just spreading FUD about it.