WANA, Pakistan (Reuters) - Pakistani security forces killed a top tribal warrior wanted for sheltering al Qaeda militants in an overnight swoop on his hideout in a remote region bordering Afghanistan, officials said Friday. Nek Mohammad, who protected foreign fighters with Osama bin Laden's al Qaeda network in the semi-autonomous South Waziristan tribal area, died with four supporters in the raid on a mud-walled compound near the region's main town of Wana, 250 miles southwest of Islamabad. Military spokesman Major General Shaukat Sultan called the strike a "big success in the war against terror" and described Mohammad as a...