ISIS involvement is not confirmed yet.
However, the TTP splinter group, that unfortunately survived, pledged their allegiance to ISIS long ago. So also, it has to be kept in view that the terrorists those who's strength is weaken and were hiding to survive, found the ISIS link for support which will not last long like before.
Claims are just made to portray their presence which is not yet confirmed nor fits the bill. Also, Tweet said (F confirmed....). ISIS is just looking for attention and some place in news that too by taking advantage of the incident.
Whether, TTP or ISIS, BLA or other terrorists organizations, all are to be dealt accordingly. The deliberate attempt wouldn't divert the attention.
Such incidents are only designed by rivals that it may appear like a terrorists attack to validate as an attack on sect/community but in wider aspects, it has to do more with CPEC as well. Also, TTP has been eliminated almost from northern areas so are now attacking on soft targets after pledging their allegiance to ISIS and by the help of terrorists organizations in Baluchistan. While looking at the stance of foreign funded ethnic political groups against CPEC, looks like they are gathered to sabotage the development.
@Neutron that is what we were afraid of, some days back while talking about internal politics. Looks like someone is hell bent to to divert every single source and mind to other issue where the incompetency and treason of ruling elite is about to be revealed and served with justice.
More bad days ahead for terrorists and their sympathizers that will be done once for all In'Sha'ALLAH.
Pakistan Zindabad