Iran is building a fence along its Pakistani border.  They say since the U.S. invasion of Afghanistan drug trafficking has increased, along with anti-Iranian terrorists.

Iran has spent U.S.$700 million, in the last two years,  fighting drug trafficking and U.S. supported terrorist.  They also claim that a Pakistani based group known as Jundollah, has been conducting terrorist operations against Iran for years.

The new fence will be built in the mountainous regions, where it is difficult to maintain a sizable border patrol force.