ISLAMABAD, Mar 9 (APP): Advisor to Prime Minister on Foreign Affairs Sartaj Aziz on Wednesday said that Pakistan and India had decided in principle to work out a mechanism providing for release of detained fishermen in two week’s time. Replying to a question in the Senate, the advisor said follow up work was in progress to give a concrete shape to the decision and release fishermen of each other’s country within two weeks after verification of their nationalities.