Try reading the article, the 'foreign hand' is Iran. This has been welling up for the last few months. The Iranian-backed 'rebels' have been blowing up major power lines leading to the capitol city.
In the 70's Iran had helped Pakistan Army quell a Baloch rebellion. For Iran, an ethnic Baloch state will mean the Baloch struggle gaining ground in Iranian Balochistan too.
In Balochistan there was always an anti-Army anti-Punjab feeling. And this is being exploited by the remnants of Al-Queda/Taliban who want to "take their revenge" against Pakistan for supporting US in the WoT.
But if you ask a Pakistani, he'll tell you that either Israel or India is behind this spurt. I read on an Pak centric website called South Asia Tribune, they had run a 'special' on the Baloch situation, the culprits according to them was the CIA, Mossad, RAW and Kremlin.