Yes
“Do you have a reliable source for this claim regarding Palestinians declaring responsibility.”
Ten year old reference? No. Was then, not now - find you own, I'm afraid.
“I find it very hard to believe.”
Hard to believe that Palestinians - who train their kids to be suicide bombers to collect a cash reward would shoot one of their own?
Or hard to believe that anyone would imagine that the highly trained IDF who are wary of killing civilians and kids would be so sloppy?
Whatever. I’m interested in your assertion and I”d like to read more, but I certainly wouldn’t be willing to believe it or quote it myself without some supporting evidence.