GARDEZ, Afghanistan (AP) Al-Qaida and Taliban fighters are regrouping in the mountains of eastern Paktia province and just over the border in Pakistan, urging the faithful to wage holy war against U.S. forces, Afghan officials say. U.S. officials and Afghan sources estimate 4,000 to 5,000 foreigners who fought for the Taliban and al-Qaida remain inside Afghanistan. Many of them are believed to be in Paktia and other provinces along the Pakistan border. They are receiving support from a variety of groups, including Kashmiri separatists, Islamic militants in Pakistan and some former officials of Pakistan