In the past two years, the number of Punjab-based militants deploying to regions bordering on Afghanistan has tripled and is now believed to be in the thousands, says analyst Mansur Mehsud.
He runs the FATA Institute, an Islamabad-based think tank studying the mix of militant groups that operate in Pakistan's tribal belt running along much of the 2,600-kilometre Afghan-Pakistan border.
Mehsud, himself from South Waziristan where militants also hide out, says more than 150 militant groups operate in the tribal regions, mostly in mountainous, heavily forested North Waziristan. Pocked with hideouts, it is there that Al Qaida leader Ayman al-Zawahri is believed to be hiding and where Afghanistan says many of its enemies have found sanctuary.
All that is changing, say analysts.
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"Before, they were keeping a low profile. But just in the last two or three years hundreds have been coming from Punjab," said Mehsud. "Everyone knows that when NATO and the American troops leave Afghanistan there will be fighting between Pashtuns and non-Pashtuns."
And the Punjabis in all likelihood will side with their fellow Pashtuns, who make up the backbone of the Afghan Taliban.
In an interview with The Associated Press in Pakistan, he said the Taliban haven't yet requested help, but when asked whether Punjab-based militants were preparing for war in Afghanistan after the foreign withdrawal, he replied: "Absolutely.