RT @BBCNewsNI: CCTV footage of two gunmen suspected to be involved in the killing of Sean Fox has been released by @PoliceServiceNI - showing them entering Donegal Celtic Social Club seconds before Mr Fox was shot. https://www.bbc.co.uk/news/uk-northern-ireland-63135677?at_custom1=video&at_custom4=175350C6-4405-11ED-AFD8-ECFF15F31EAE&at_medium=custom7&at_custom2=twitter&at_custom3=BBC+News+NI&at_campaign=64