The men killed are thought to be foreign fighters – possibly Uzbek or Arab.
In the two months leading up to the Nato summit, there were only three recorded strikes.
Relations between Pakistan and American have remained close to breaking point after 24 Pakistani soldiers were mistakenly killed by US air strikes close to the Afghan border in November last year.
Islamabad immediately halted Nato supply convoys and has hardened its stance against drones, which were previously given secret approval.
Observers believe the CIA slowed its use of unmanned aircraft in order to give talks in Chicago a chance of success.
But President Obama delivered a stinging snub during the summit, denying President Zardari a one-on-one meeting and voicing frustration with Islamabad.
“The talks in Chicago did not go well and now we see a spike in drone activity: Do the math, as our American friends might say,” said a security official, speaking on condition of anonymity.
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