I was playing the other day and I was west of Megaton, ahead of where the road splits into two, below a cliff I encountered 3 nonhostile wastelanders, upon talking to them, they mentioned about going for a treasure north I believe, then they turned hostiles and tried to kill me.
I managed to kill them and didn't check the new marker on my map, sadly I was low on health before this and a giant radscorpion ambushed me not far from there and killed me.
Sadly I didn't save for quite sometime and when I tried to find these guys I failed to do so. It was nighttime but I don't know around what time when I encountered these guys.
Does anybody know how to trigger these guys?