18:00Six O'Clock News31/07/2015: Cameron sounds migrant warningBBC Radio 4 Duration: 30 minutes Fri 31st Jul 2015, 18:00 on BBC Radio 4 FMAvailable for over a yearListen nowCameron warns migrants crisis will last all summer - and a new ebola vaccine is hailedGenresNewsFormatsBulletinsBrandSix O'Clock News Source: BBC Online