Excerpt from US Department of State
2006 Country Report on Pakistan :
On February 24, a group of 16 men, presumed to be plainclothes police officers, seized Dr. Safdar Sarki, an American citizen and a Sindhi nationalist, in Karachi. According to AI, witnesses saw Sarki being taken in a van, "blindfolded and bleeding." AI reported that police ransacked Sarki's apartment and took his laptop computer and passport. Sarki was the secretary general of the Jeay Sindh, a Sindhi nationalist political organization advocating for the rights of Sindhi citizens.
... Despite repeated requests to ascertain the whereabouts of "disappeared" foreign citizen Safdar Sarki, diplomats were denied both information about his whereabouts and access (see section 1.b.).