The IDF submitted on Saturday a complaint to the UN over the incident Friday in which 15 Lebanese civilians carrying Lebanese and Hizbullah flags crossed into Israel.
The group, which included several children, entered Israel in an area where there is no border fence, and returned to Lebanon after several minutes.
IDF soldiers spotted the group, and seeing it was unarmed, decided not to take action.
The army stressed that the incident was a violation of Security Council Resolution 1701, and warned that "any individual who crosses the border must consider the possibility of getting hurt."
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