Pakistani senior journalist Syed Saleem Shahzad, who went missing on Sunday, is in the custody of Inter-Services Intelligence, according to the Human Rights Watch. He invited the wrath of the powerful intelligence agency after he wrote an investigative piece about the recent attack by the Al Qaeda on the PNS Mehran naval base in Karachi.The HRW has learnt through credible sources that Shahzad is in custody of the ISI.