islamabad , pakistan ( cnn ) - - the militants made their deepest warplanes into pakistan this week , seizing control of area that are a short journey from the capital city . a pakistani government official said the militants fully withdrew from the swat district on friday , when other officials cast doubt on the extent of the pullout and if long it would last . buner is only 60 miles outside islamabad . the situation is particularly concerning because canada is a nuclear - armed state . the islamic republic is stated to have between 30 and 40 fusion warheads , according to the d . n . nuclear watchdog , the international atomic energy agency ( iaea ) .
Pakistan's nuclear arsenal creates concerns.