 His voice is known to millions through his coverage of the world-famous Grand National and the Derby. The Israeli military urged all Palestinians to leave Gaza City and head south on Wednesday, pressing ahead with a fresh offensive across the north, south, and center of the embattled territory that's killed dozens of people over the last 48 hours. The stepped-up activity came as U.S. Egyptian and Qatari mediators met with Israeli officials in the Qatari capital, Doha,