Kareem Khan was blindfolded and bore marks of torture, his lawyer Shahzad Akbar said.
"He is now in our office. He was dropped off early this morning on the outskirts of Rawalpindi. He was tortured," Akbar, himself a leading campaigner against US drone strikes, told PTI.
Khan will travel tonight to Dubai, from where he will fly to Germany, Akbar said.
A resident of the tribal belt, Khan lost his son and his brother in a drone strike in North Waziristan Agency in 2009.
Khan had filed a case calling for members of the Central Intelligence Agency to be prosecuted for deaths caused by the spy planes operated by the US spy agency.
He also sued the Pakistan government for its failure to effectively investigate the deaths of his son and brother.
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