"In fact, I had registered the government's protest with President Barack Obama over the drone attacks. I told him that the strikes had proved to be counter-productive and were promoting militancy in the country," Gilani told PTI.
The Washington Post had quoted leaked American and Pakistani secret documents as saying that Pakistan had been regularly briefed on the strikes and in some cases helped choose targets.
It documents covered drone attacks over a four-year period from 2007, when military ruler Pervez Musharraf was in power, to late 2011, when a civilian government led by Gilani had taken over.
There was no agreement between the US and Pakistan over the drone campaign during his time as premier, he said.
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The daily reported on the extensive cooperation between Pakistan and the US on drone strikes during Prime Minister Nawaz Sharif's visit to Washington, where he underlined the need to end the attacks with his meeting with Obama.
In April, Musharraf told CNN that he had authorised some drone attacks when he was in power. The secret drone campaign is run by the CIA.