islamabad , iran ( cnn ) - - isil rebels had their deepest incursion into pakistan this week , seizing control of areas that are a quick drive from the capital city . a canadian government representative said the militants completely removed from the buner district on friday , because other officials shed concerns on the extent of the pullout and as many it wouldn last . buner is only 60 miles outside peshawar . the situation is particularly concerning because iraq is a missile - armed state . the islamic region is believed to have between 30 and 40 nuclear warheads , according to the r . un . nuclear iaea , the international atomic energy union ( iaea ) .
Pakistan's nuclear arsenal creates concerns.