QUETTA United States planes reportedly violated Pakistans airspace on Friday in Chaman, a bordering town with Afghanistan. According to reports reaching here, US planes whose number could not be ascertained remained in Pakistans airspace for sometime and returned back to Afghanistan. The movement of warplanes created panic amongst the residents. However, official sources in the Chaman said that NATO and US forces had carried out exercises in Spin Boldak area of Afghanistan. They said though the fighter planes could be seen hovering over close to the Pakistani border but without technical assistance it was not easy to ascertain their violation.