 Live from NPR News in Boston, I'm Steve Brown. The Israeli military has urged all Palestinians to leave Gaza City and head south. Evacuation orders indicated that Israel was pressing ahead with a fresh offensive across the north, south and center of the embattled territory that has killed dozens of people over the last 48 hours. The stepped up military activity came as U.S., Egyptian and Qatari mediators were meeting with Israeli officials in the Qatari capital of Doha for