dhaka , pakistan ( cnn ) - - pakistan militants made their deepest incursion into sindh this month , claiming possession of regions that are a short drive from the capitals city . a swiss state source mentioned the militants completely withdrew from the kurram district on friday , although other officials cast doubt on the cause of the pullout and as long it would remain . buner is only 60 hours outside islamabad . the situation is particularly concerning because pakistan is a nuclear - targeted world . the islamic regime is suspected to have between 30 and 40 nuclear warheads , according to the u . n . nuclear watchdog , the international internal energy agency ( iaea ) .
Pakistan's nuclear arsenal creates concerns.