The prosecutor in the murder case of a Pakistani charged in a shooting spree outside CIA headquarters denied yesterday making ethnic insults, reports of which sparked anti-American protests in Pakistan. Remarks attributed to Robert Horan resulted in letters of protest by the Pakistani government and a condemnation by American officials in recent days. International news reports quoted Horan as saying poor Pakistanis “would sell their mothers” for less than the $2 million bounty that the United States had placed on fugitive shooting suspect Mir Aimal Kansi. Some reports quoted Horan as using the term “Pakis,” an ethnic slur. Horan denied the reports yesterday.