Civilian interception question

[Ruberto]

Hello
Does shooting down a civilian (green) craft in itself incurs Infamy penalty?
I know the crash site cleanup missions won't give me much positive score, but does the act of shooting them down in itself causes penalty?
Also
sometimes Very small ufos are shown to be 3 dudes running around. how can i distinguish whenever they are civilians or not and can I somehow assault them with troops instead of shooting them to bits from on high?

[legionof1]

only green hulled ships(in craft preview) are civvies. The groups of men are fair game, being either bandits or ratmen bands,

[Ruberto]

only green hulled ships(in craft preview) are civvies. The groups of men are fair game, being either bandits or ratmen bands,

Thanks
and what about
Does shooting down a civilian (green) craft in itself incurs Infamy penalty?