US envoy Frank Lowenstein was due in Cairo on Wednesday night to try to help Egyptian-mediated talks between Israel and the Palestinians find a lasting end to their conflict over the Gaza Strip, the US State Department said. Lowenstein is the acting US special envoy for Israeli-Palestinian negotiations. 'We, along with our partners, are working to find a way forward that brings an end to the violence and addresses the underlying causes of this crisis,' State Department spokesman Edgar Vasquez said in announcing the trip.