Inter-Services Intelligence (ISI) chief Lt General Zaheerul Islam has left for Washington to hold talks with his CIA counterpart David Petraeus, the first meeting between the spy chiefs amidst persisting tension between the two countries. The ISI chief would hold talks in Washington on August 1-3 with his CIA counterpart, a military statement said. US drone strikes in Pakistan are expected to be a major issue. “This will be a service-to-service bilateral visit,” the statement said. The short statement gave no other details, but a senior Pakistani security official earlier said that the chiefs of the two spy agencies would discuss counter-terror cooperation and intelligence sharing. During his visit, General Islam would also demand an end to US drone attacks on Pakistani territory, a security official said.