What is going on along the Afghan/Pakistan border?

There have been a number of incidents of violence in the last week along the Afghan/Pakistan border (Afghan, Pakistani forces exchange fire, four dead, Three U.S., 2 Pakistanis hurt in Afghan border firing,) and frankly, I'm not really clear as to what's going on, but when I read something like this.....

Tension gripped Kurram Agency on Wednesday as the Pakistan Army sent reinforcements to the Pak-Afghan border following reports that the Afghan National Army had deployed in significant numbers on the Durand Line along with extra artillery and mortar guns.

The situation became even more serious in the evening when the political administration decided to make announcements from mosques and through vehicles fitted with loudspeakers about the possibility of outbreak of firing on the Pak-Afghan border. It advised the people not to become scared due to intense firing because this would be due to the situation on the border and on account of external factors. It said the firing should not be construed as a new outbreak of violence due to any internal conflict.....

Reports from across the border spoke of a similar evacuation from the Afghan villages near the Durand Line. There were reports that villagers were evacuating from the border areas in the Jaji and Chamkani districts, both part of Paktia province.

Earlier, reports from Paktia said the Afghan tribal and village elders had held a big meeting in the Alikhel Garrison and overwhelmingly pledged to retake the land allegedly annexed by Pakistani forces on the border.

I don't know, I'm just putting it out there....