Chinese President Hu Jintao has urged Pakistan to track down the gunmen who killed three Chinese engineers in a drive-by shooting, Xinhua news agency said on Thursday. The attack occured near the southern town of Hub, outside Karachi, ahead of a planned visit to China by Pakistani President Perves Musharraf on Sunday. A spokesman for the Baluch Liberation Army claimed responsibility, warning against outsiders seeking to exploit the southwestern province of Baluchistan’s mineral resources. Full Story