Four dead in US drone strike in Pakistan Relations between the US and Pakistan came close to breaking down completely after US troops in Afghanistan called in an airstrike on a Pakistani border post on November It is understood that Cameron Munter, the US ambassador to Islamabad, asked for the pause to help rebuild relations with Pakistan. The strikes are a constant source of anger and are blamed for killing hundreds of civilians. Pakistan also threatened to shoot down drones and ordered the US to leave the Shamsi airbase in the south-west of the country, which it had been using as a base for unmanned aircraft, as Islamabad sought to distance itself from its ally in the war on terror after the November 26 cross-border raid. For the time being, Pakistan's borders with Afghanistan remain closed to Nato convoys shutting off a key supply route to more than 100,000 international forces.