The head of Pakistani intelligence agency ISI, Lieutenant-General Ahmad Shuja Pasha today left for Islamabad after two days of intense talks with top officials of the CIA in the United States.A series of meetings was held between Pasha and acting CIA Director Michael Morell in Langley, Virginia. Officials said during the talks, two sides shared their concerns about each other.It is understood that the ISI chief raised the issue of increasing CIA activities inside his country without taking the ISI into confidence. The CIA, on the other hand, raised the issue of leaking of intelligence information being shared with Pakistan, which it argued provides escape route to the terrorists inside the country.Noting that the meetings went very well officials from both sides said they agreed to implement on a number of confidence building measures.