As the US vacates the Shamsi air base in Pakistan's Balochistan province, a senior Pakistani military official has told a US television network that his country "will shoot down any US drone that enters its territory".<br /><br />Shamsi is believed to be the staging post for the US drones operating in northwest Pakistan and neighbouring Afghanistan.<br /><br />Al Jazeera's Kamal Hyder reports from Islamabad.
