18:00Six O'Clock News22/11/2015 The Government steps up its case for airstrikes on IS in SyriaBBC Radio 4 Duration: 15 minutes Sun 22nd Nov 2015, 18:00 on BBC Radio 4 FMAvailable for over a yearListen nowThe Government begins making the case for airstrikes against IS militants in SyriaThe high terror alert in Brussels is to continueGenresNewsFormatsBulletinsBrandSix O'Clock News Source: BBC Online