Top representatives from the United States, Israel, Qatar and Egypt are continuing their efforts to achieve a ceasefire and hostage exchange in the Gaza war, as tensions rise over a possible Israeli ground operation in Rafah. The head of the Israeli secret service Mossad, David Barnea, arrived in Cairo for talks on Tuesday, dpa learnt from airport sources. He was accompanied by Ronen Bar, the head of the Shin Bet domestic intelligence service and others. Israeli government sources also reported on Tuesday that the delegation was in Cairo for new negotiations on another hostage deal with the Pa…