Israeli Prime Minister Benjamin Netanyahu walks to the podium during a joint press conference with British Foreign Secretary Philip Hammond on July 24, 2014 at the Knesset in Jerusalem. Speaking on his first official visit to the region since taking over as Britain's top diplomat, Hammond said Britain is 'gravely concerned' by the high number of civilian casualties resulting from Israel's military operation in Gaza while Netanyahu said Israel was doing everything it could to minimise casualties, pinning the blame on Hamas for using civilians as 'human shields'.