http://www.google.com/hostednews/ca...qM5iwTcKIQC_2Cb7gyiNAKWHZiXEFUg?docId=6678567 DERA ISMAIL KHAN, Pakistan â€” Afghan border guards fired mortar shells toward a Pakistani military post in a northwestern tribal region on Wednesday, killing a soldier and wounding two others, a Pakistani government official said. The mortars also wounded at least six local residents and damaged dozens of shops in the Angore Adda town of the South Waziristan region, Atifur Rehman said. "Pakistani security forces are also returning fire," he said. No Pakistan army spokesman was immediately available for comment. The latest clash came a day after Pakistani and Afghan forces traded artillery fire in the neighbouring North Waziristan tribal region, causing panic among residents. Afghan military official Abdul Rahman confirmed late Tuesday's clash in North Waziristan. Afghan and Pakistan forces stationed along the rugged, porous border between their countries occasionally trade fire but the incidents rarely escalate or have diplomatic consequences. The clashes sometimes involve troops pursuing Taliban militants who travel from one side of the border to the other.