 Welcome to the programme. This is NewsHour on the BBC World Service. Hello, I'm Paul Henley. We're coming to you live from London. The Israeli military have dropped leaflets over Gaza City, telling all residents to leave and warning that it's about to become a combat zone. There are estimated to be more than a quarter of a million people still living there. It's the second time people have been told to flee the city since the start of this conflict.