22:00The World TonightIS Linked to California AttackBBC Radio 4 Duration: 45 minutes Fri 4th Dec 2015, 22:00 on BBC Radio 4 LWAvailable for over a yearListen nowIn-depth reporting and analysis from a global perspective. A mass shooting that left 14 people dead is being investigated as an act of terrorism.GenresNewsBrandThe World Tonight Source: BBC Online